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PQ CORPORATION

57 Marks
Corp.
First Filed:Oct 2, 1918Latest Filed:Mar 19, 2019Address:Valleybrooke Corporate Center, Malvern, PA 193551740

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Industrial Chemicals & Adhesives
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Pharmaceuticals
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Trademark Activity Timeline(1980 – 2020)

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77 results

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Filed
Registered
Last Activity
LUBRISAVE
LUBRISAVE
Trademark
Word
REGISTERED
Owner:
Serial:88345905
Filed:Mar 19, 2019
Classes:1
Registration:6165024
Registered:Sep 29, 2020
Description: Chemical preparations, namely, silica based adsorbents for adsorbing chemical impurities from organic compounds
ALPHAPURE
ALPHAPURE
Trademark
Word
CANCELLED
Owner:
Serial:87040202
Filed:May 17, 2016
Classes:1
Registration:5370895
Registered:Jan 2, 2018
PQ
PQ
Trademark
Word
REGISTERED
Owner:
Serial:86911048
Filed:Feb 17, 2016
Classes:1, 3, 40, +1
Registration:5243848
Registered:Jul 18, 2017
Description: Industrial chemicals and specialty chemicals, namely, sodium silicates, potassium silicates, amorphous silicon dioxide, magnesium silicate, and magnesium sulfate; paint additives for use in the manufacture of paint including flattening agents and silicas for reducing reflection of paint and to add texture; chemical paint additives including flattening agents and silicas for reducing reflection of paint and to add texture; abrasives for use in the manufacture of dental abrasives | All purpose cleaning preparations, industrial use detergents | Technical advice and technical consultancy relating to the use of water treatment chemicals for treating water | technical advice and technical consultancy relating to chemical research concerning the use of silicates, water treatment chemicals, and other chemical products
RUNCLEAN
RUNCLEAN
Trademark
Word
ABANDONED
Owner:
Serial:86278512
Filed:May 12, 2014
Classes:1
PREXSIL
PREXSIL
Trademark
Word
CANCELLED
Owner:
Serial:85105051
Filed:Aug 11, 2010
Classes:1
Registration:4091844
Registered:Jan 24, 2012
SIL-MATRIX
SIL-MATRIX
Trademark
Word
ABANDONED
Owner:
Serial:78837810
Filed:Mar 15, 2006
Classes:5
Description: Fungicides, miticides, and insecticides for agricultural use
SIL-MATRIX
SIL-MATRIX
Trademark
Word
REGISTERED
Owner:
Serial:78786387
Filed:Jan 6, 2006
Classes:5
Registration:3370531
Registered:Jan 15, 2008
Description: Fungicides, miticides, and insecticides for agricultural use
DRYMET
DRYMET
Trademark
Word
CANCELLED
Owner:
Serial:78699305
Filed:Aug 24, 2005
Classes:1
Registration:3212457
Registered:Feb 27, 2007
CERAMSIL
CERAMSIL
Trademark
Word
CANCELLED
Owner:
Serial:78501603
Filed:Oct 18, 2004
Classes:1
Registration:3053918
Registered:Jan 31, 2006
LITHISIL
LITHISIL
Trademark
Word
REGISTERED
Owner:
Serial:78497797
Filed:Oct 11, 2004
Classes:1
Registration:3288636
Registered:Sep 4, 2007
Description: Lithium silicate
TS-PQ
TS-PQ
Trademark
Word
CANCELLED
Owner:
Serial:76423971
Filed:Jun 19, 2002
Classes:1
Registration:2909062
Registered:Dec 7, 2004
Description: Chemicals, namely, titanium/silicon materials for use in catalytic and adsorption processes
COOL
COOL
Service Mark
Word
CANCELLED
Owner:
Serial:76418206
Filed:Jun 10, 2002
Classes:35
Registration:2700135
Registered:Mar 25, 2003
Description: Computer electronic commerce services, namely, providing on-line ordering of industrial and specialty chemicals and glass particles via a global computer information network
CRYSTAMET
CRYSTAMET
Trademark
Word
CANCELLED
Owner:
Serial:76379971
Filed:Mar 8, 2002
Classes:1
Registration:2668938
Registered:Dec 31, 2002
Description: Crystalline alkali metal silicate useful in neutralising acids, cleaning, or the manufacture of silicated soaps or detergent compounds
E
E
Trademark
Stylized
ABANDONED
Owner:
Serial:76291659
Filed:Jul 30, 2001
Classes:1
Description: Silicate-based chemicals for use in the preparation of well drilling fluids
ECODRILL
ECODRILL
Trademark
Combined
CANCELLED
Owner:
Serial:76291657
Filed:Jul 30, 2001
Classes:1
Registration:2725447
Registered:Jun 10, 2003
Description: Silicate-based chemicals for use in the preparation of well drilling fluids
E ECODRILL
E ECODRILL
Trademark
Combined
CANCELLED
Owner:
Serial:76291662
Filed:Jul 30, 2001
Classes:1
Registration:2722304
Registered:Jun 3, 2003
Description: Silicate-based chemicals for use in the preparation of well drilling fluids
JUMBOGEMS
JUMBOGEMS
Trademark
Word
CANCELLED
Owner:
Serial:76218976
Filed:Mar 5, 2001
Classes:5
Registration:2584933
Registered:Jun 25, 2002
V
V
Trademark
Word
CANCELLED
Owner:
Serial:76218975
Filed:Mar 5, 2001
Classes:1
Registration:2569790
Registered:May 14, 2002
MEDOX
MEDOX
Trademark
Word
CANCELLED
Owner:
Serial:75649720
Filed:Mar 1, 1999
Classes:1
Registration:2399245
Registered:Oct 31, 2000
Description: Zeolites for use as molecular sieves, adsorbents, ion exchangers, desiccants, fillers, carriers, and separation preparations, in medical devices including medical oxygen concentrators
ADVERA
ADVERA
Trademark
Word
REGISTERED
Owner:
Serial:75391057
Filed:Nov 17, 1997
Classes:1
Registration:2291491
Registered:Nov 9, 1999
Description: Zeolites for use as molecular sieves, absorbents, ion exchangers, desiccants, fillers, carriers, and separation products all for use in the manufacture of polymers and plastics or air, soil and water treatment products
PQ SIEVES
PQ SIEVES
Trademark
Word
CANCELLED
Owner:
Serial:75346688
Filed:Aug 25, 1997
Classes:1
Registration:2190931
Registered:Sep 22, 1998
Description: Aluminosilicates for general industrial use as adsorbents desiccants, drying agents, air separators; "SIEVES"
FASTACK
FASTACK
Trademark
Word
ABANDONED
Owner:
Serial:75127419
Filed:Jul 1, 1996
Classes:1
Description: Silicate adhesive compositions for use in the manufacture of paperboard
GO SOAK YOURSELF
GO SOAK YOURSELF
Trademark
Word
CANCELLED
Owner:
Serial:75127420
Filed:Jul 1, 1996
Classes:25
Registration:2161292
Registered:Jun 2, 1998
Description: Clothing, namely, T-shirts and sweatshirts
BRITESORB
BRITESORB
Trademark
Word
CANCELLED
Owner:
Serial:73493916
Filed:Aug 8, 1984
Classes:1
Registration:1347046
Registered:Jul 9, 1985
Description: SILICA GEL IN THE FORM OF BEADS USED AS DESICCANTS AND ADSORBENTS
SILPREC
SILPREC
Trademark
Word
CANCELLED
Owner:
Serial:73463669
Filed:Feb 1, 1984
Classes:1
Registration:1386407
Registered:Mar 18, 1986
Description: MAGNESIUM SILICATE FOR USE IN MANUFACTURING
BRITESORB
BRITESORB
Trademark
Word
CANCELLED
Owner:
Serial:73434826
Filed:Jul 15, 1983
Classes:1
Registration:1345389
Registered:Jul 2, 1985
Description: Chemical Composition Containing Magnesium Silicate Used for Beer Clarification, Polyol Scavenging, Wine Fining, Selective Adsorption and Ion Exchange
ACOR
ACOR
Trademark
Word
CANCELLED
Owner:
Serial:73295396
Filed:Feb 2, 1981
Classes:1
Registration:1252580
Registered:Oct 4, 1983
Description: Chemicals-Namely, Liquid Sodium Silicate Used in Enhanced Oil Recovery Processes
VALFOR
VALFOR
Trademark
Word
REGISTERED
Owner:
Serial:73251441
Filed:Feb 25, 1980
Classes:1
Registration:1196032
Registered:May 25, 1982
Description: Aluminosilicates for General Industrial Uses for Ion Exchange, Catalysis, Adsorption and Drying, Abrasive Agents, Cleaning Compounds, Personal Care Products, Agriculture, Food Products, Cosmetics, and Pharmaceutical Additives
ALKABRITE
ALKABRITE
Trademark
Word
CANCELLED
Owner:
Serial:73244748
Filed:Dec 31, 1979
Classes:1
Registration:1212033
Registered:Oct 12, 1982
Description: Silicated, Phosphated Alkaline Detergent Builder for Industrial Use
ISP
ISP
Trademark
Word
EXPIRED
Owner:
Serial:73177829
Filed:Jul 11, 1978
Classes:7
Registration:1114397
Registered:Mar 6, 1979
Description: LIQUID LAUNDRY SYSTEM FOR COMMERCIAL, INDUSTRIAL AND INSTITUTIONAL USE
METSO
METSO
Trademark
Word
REGISTERED
Owner:
Serial:72341099
Filed:Oct 20, 1969
Classes:1, 6
Registration:0898540
Registered:Sep 15, 1970
Description: HOUSEHOLD AND INDUSTRIAL CLEANING PREPARATIONS; SOLUBLE ALKALI SILICATES
METSO PENTABEAD
METSO PENTABEAD
Trademark
Word
REGISTERED
Owner:
Serial:72291094
Filed:Feb 14, 1968
Classes:1, 6
Registration:0872397
Registered:Jul 8, 1969
Description: SOLUBLE ALKALI SILICATES
METSO BEADS
METSO BEADS
Trademark
Word
REGISTERED
Owner:
Serial:72249354
Filed:Jun 30, 1966
Classes:1, 6
Registration:0832792
Registered:Aug 1, 1967
Description: SOLUBLE ALKALI SILICATES
BRITESORB
BRITESORB
Trademark
Stylized
EXPIRED
Owner:
Serial:72204946
Filed:Oct 28, 1964
Classes:1, 6
Registration:0794290
Registered:Aug 17, 1965
Description: MAGNESIUM SILICATE
PQ
PQ
Trademark
Stylized
EXPIRED
Owner:
Serial:72191709
Filed:Apr 21, 1964
Classes:3, 6
Registration:0805394
Registered:Mar 15, 1966
Description: NONIONIC AND ANIONIC SURFACE ACTIVE AGENTS AND DETERGENTS FOR WASHING AND LAUNDERING OPERATIONS; WASHING COMPOSITIONS; DEDUSTING COMPOSITIONS CONTAINING SOME PARAFFIN OILS; SOLUBLE INORGANIC ALKALI SILICATES; SOLUBLE ORGANIC ALKALI SILICATES; MICROFINE SYNTHETIC SILICAS [ ; LAUNDRY SOURS; BLEACHING COMPOSITIONS, ]
PQ
PQ
Trademark
Word
CANCELLED
Owner:
Serial:72191708
Filed:Apr 21, 1964
Classes:1, 5, 6
Registration:0807715
Registered:May 3, 1966
Description: NONIONIC AND ANIONIC SURFACE ACTIVE AGENTS AND DETERGENTS FOR WASHING AND LAUNDERING OPERATIONS; WASHING COMPOSITIONS; AND LAUNDRY DEDUSTING COMPOSITIONS CONTAINING SOME PARAFFIN OILS; SOLUBLE INORGANIC ALKALI SILICATES; SOLUBLE ORGANIC ALKALI SILICATES; BLEACHING COMPOSITIONS AND LAUNDRY SOURS; AND MICROFINE SYNTHETIC SILICAS; SILICEOUS BINDERS AND FILLERS FOR REFRACTORY CEMENTS AND ACID-RESISTANT CEMENTS; PARTING COMPOSITIONS FOR ADHESIVE OPERATIONS; AND ADHESIVES CONTAINING SOLUBLE ALKALI SILICATES
FABRICON
FABRICON
Trademark
Combined
CANCELLED
Owner:
Serial:72121488
Filed:Jun 6, 1961
Classes:3, 6
Registration:0732619
Registered:Jun 12, 1962
Description: Lubricant and Softener Used in the Washing of Fabrics and Sold to the Commercial Laundry Industry
ALKADET
ALKADET
Trademark
Word
CANCELLED
Owner:
Serial:72113534
Filed:Feb 13, 1961
Classes:1
Registration:0722688
Registered:Oct 10, 1961
Description: Powdered Alkali Detergent for Industrial Laundering of Textile Fabrics
FABRISOF
FABRISOF
Trademark
Word
CANCELLED
Owner:
Serial:72077256
Filed:Jul 8, 1959
Classes:3, 6
Registration:0698790
Registered:Jun 7, 1960
Description: Fabric Softener for Use in the Washing of Fabrics
GD
GD
Trademark
Stylized
REGISTERED
Owner:
Serial:71570631
Filed:Dec 16, 1948
Classes:1, 6
Registration:0526917
Registered:Jun 27, 1950
Description: SODIUM SILICATE
Q
Q
Trademark
Stylized
EXPIRED
Owner:
Serial:71566545
Filed:Oct 6, 1948
Classes:1, 6
Registration:0517984
Registered:Nov 22, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
STARSO
STARSO
Trademark
Stylized
REGISTERED
Owner:
Serial:71554149
Filed:Apr 8, 1948
Classes:1, 6
Registration:0510420
Registered:May 31, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
A
A
Trademark
Stylized
REGISTERED
Owner:
Serial:71544502
Filed:Sep 23, 1947
Classes:1, 6
Registration:0509700
Registered:May 10, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
B
B
Trademark
Word
CANCELLED
Owner:
Serial:71549319
Filed:Sep 23, 1947
Classes:1, 6
Registration:0506757
Registered:Feb 15, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
G
G
Trademark
Stylized
REGISTERED
Owner:
Serial:71544503
Filed:Sep 23, 1947
Classes:1, 6
Registration:0509701
Registered:May 10, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
J
J
Trademark
Word
CANCELLED
Owner:
Serial:71547392
Filed:Sep 23, 1947
Classes:1, 6
Registration:0506735
Registered:Feb 15, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
M
M
Trademark
Word
REGISTERED
Owner:
Serial:71547393
Filed:Sep 23, 1947
Classes:1, 6
Registration:0506736
Registered:Feb 15, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
N
N
Trademark
Word
REGISTERED
Owner:
Serial:71547394
Filed:Sep 23, 1947
Classes:1, 6
Registration:0506737
Registered:Feb 15, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *
O
O
Trademark
Word
REGISTERED
Owner:
Serial:71547395
Filed:Sep 23, 1947
Classes:1, 6
Registration:0506738
Registered:Feb 15, 1949
Description: * SODIUM * SILICATE [ OF SODA ]
SS
SS
Trademark
Word
REGISTERED
Owner:
Serial:71543036
Filed:Sep 23, 1947
Classes:1, 6
Registration:0507666
Registered:Mar 15, 1949
Description: [ SILICATE OF SODA ] * SODIUM SILICATE *, EITHER ANHYDROUS, HYDRATED, OR IN SOLUTION
STIXSO
STIXSO
Trademark
Stylized
CANCELLED
Owner:
Serial:71462460
Filed:Aug 2, 1943
Classes:1, 5
Registration:0405157
Registered:Jan 11, 1944
Description: Adhesives Containing Vegetable Protein and [ Silicate of Soda ] Sodium Silicate or Either of Them and Used for the Manufacture of Fibre Board for Use as Wall Board or for the Manufacture of Container Stock of Either Corrugated or Laminated Construction
RUSTICON
RUSTICON
Trademark
Word
CANCELLED
Owner:
Serial:71432696
Filed:Jun 5, 1940
Classes:1, 6
Registration:0382134
Registered:Oct 15, 1940
Description: Substance for Preventing Rust, Corrosion, or Scale in Boilers, Radiators, and Hot Water Systems
P'S & Q'S.
P'S & Q'S.
Trademark
Stylized
CANCELLED
Owner:
Serial:71155633
Filed:Nov 19, 1921
Classes:16, 38
Registration:0157560
Registered:Aug 8, 1922
Description: A Series of Pamphlets, Booklets, or Leaflets Published from Time to Time
K
K
Trademark
Stylized
REGISTERED
Owner:
Serial:71121942
Filed:Aug 23, 1919
Classes:1, 6
Registration:0129525
Registered:Feb 24, 1920
Description: Sodium Silicate
P-Q
P-Q
Trademark
Stylized
CANCELLED
Owner:
Serial:71118933
Filed:May 26, 1919
Classes:1, 6
Registration:0127479
Registered:Nov 11, 1919
Description: Sodium Silicate
B-W
B-W
Trademark
Stylized
EXPIRED
Owner:
Serial:71114483
Filed:Dec 4, 1918
Classes:1, 6
Registration:0125499
Registered:May 20, 1919
Description: SODIUM SILICATE
T
T
Trademark
Stylized
EXPIRED
Owner:
Serial:71113527
Filed:Oct 2, 1918
Classes:1, 6
Registration:0124937
Registered:Mar 25, 1919
Description: SODIUM SILICATE
CURESIL
CURESIL
Trademark
Word
Previous
REGISTERED
Owner:
Serial:87094690
Filed:Jul 6, 2016
Classes:1
Registration:6075206
Registered:Jun 9, 2020
Description: Silicates; chemicals for use in industry, namely, amorphous networks of polymeric aluminosilicates
ALPHACAT
ALPHACAT
Trademark
Word
Previous
REGISTERED
Owner:
Serial:77876342
Filed:Nov 19, 2009
Classes:1
Registration:3817359
Registered:Jul 13, 2010
Description: Silica gel beads and silica gel supported catalyst beads
BRITESORB
BRITESORB
Trademark
Word
Previous
REGISTERED
Owner:
Serial:78605183
Filed:Apr 8, 2005
Classes:1
Registration:3073593
Registered:Mar 28, 2006
Description: Adsorbents for refining oil and clarifying beer
ECODRILL
ECODRILL
Trademark
Word
Previous
REGISTERED
Owner:
Serial:76291658
Filed:Jul 30, 2001
Classes:1
Registration:2670146
Registered:Dec 31, 2002
Description: Silicate-based chemicals for use in the preparation of well drilling fluids
AGSIL
AGSIL
Trademark
Word
Previous
REGISTERED
Owner:
Serial:76261485
Filed:May 24, 2001
Classes:1
Registration:2626501
Registered:Sep 24, 2002
Description: Potassium silicate for agricultural use
L
L
Trademark
Word
Previous
REGISTERED
Owner:
Serial:76218977
Filed:Mar 5, 2001
Classes:1
Registration:2573354
Registered:May 28, 2002
Description: Chemicals, namely, sodium silicate for use in the manufacture of silicate-containing compounds
GO SOAK YOURSELF
GO SOAK YOURSELF
Trademark
Word
Previous
REGISTERED
Owner:
Serial:75525775
Filed:Jul 27, 1998
Classes:5
Registration:2281383
Registered:Sep 28, 1999
Description: Epsom salt
MAGNAGROW
MAGNAGROW
Trademark
Word
Previous
REGISTERED
Owner:
Serial:75083514
Filed:Apr 4, 1996
Classes:1
Registration:2109859
Registered:Oct 28, 1997
Description: Agricultural grade magnesium sulfate heptahydrate for use as plant food
EXTENDOSPHERES
EXTENDOSPHERES
Trademark
Word
Previous
CANCELLED
Owner:
Serial:74156429
Filed:Apr 12, 1991
Classes:1
Registration:2689573
Registered:Feb 25, 2003
Description: Particulate material consisting of hollow glass microspheres useful as fillers for plastics and paints
IMPAQ
IMPAQ
Trademark
Word
Previous
CANCELLED
Owner:
Serial:73651364
Filed:Mar 25, 1987
Classes:1
Registration:1466071
Registered:Nov 24, 1987
Description: CHEMICAL PRODUCTS FOR USE IN CHROMATOGRAPHY
METALITE
METALITE
Trademark
Word
Previous
REGISTERED
Owner:
Serial:73572886
Filed:Dec 11, 1985
Classes:1
Registration:1467816
Registered:Dec 8, 1987
Description: PARTICULATE MATERIAL CONSISTING OF METAL-CLAD HOLLOW MICROSPHERES USEFUL AS FILLERS FOR STRUCTURAL PLASTICS, PAINTS, INDUSTRIAL COATINGS AND THE LIKE
VALTRON
VALTRON
Trademark
Word
Previous
CANCELLED
Owner:
Serial:73414568
Filed:Feb 22, 1983
Classes:1, 2
Registration:1291603
Registered:Aug 28, 1984
Description: Silicone and Epoxy-Based Coatings for Use in the Semiconductor Industry; Processing Aids and Materials Principally for the Semiconductor Industry-Namely, Adhesives, Chemical-Type Cleaning Preparations and Surface Preparation Compounds, Diffusants, Dopants, Etchants, Primers, Photoresists, Plating Solutions, and Encapsulants
RADICATE
RADICATE
Trademark
Word
Previous
CANCELLED
Owner:
Serial:73308850
Filed:May 6, 1981
Classes:3
Registration:1260725
Registered:Dec 13, 1983
Description: Stain Remover for Commercial Laundry Use
KASOLV
KASOLV
Trademark
Word
Previous
REGISTERED
Owner:
Serial:73267856
Filed:Jun 25, 1980
Classes:1
Registration:1202446
Registered:Jul 27, 1982
Description: Hydrous Potassium Silicate for Use as Binder, Gelling or Thickening Agent
73207874
73207874
Trademark
Design
Previous
REGISTERED
Owner:
Serial:73207874
Filed:Mar 19, 1979
Classes:1, 2, 3, +3
Registration:1163243
Registered:Aug 4, 1981
Description: Cleaning Preparations, Abrasive Preparations and Detergents, Including Formulated Cleaning Compounds for Commercial and Institutional Use, Such as Detergents, Builders, Bleaches and Sours; Paints and Paint Additives, Including Flatting Agents, Silicas, [ and Reflective Glass Beads ]; Industrial Chemicals and Specialty Chemicals-Namely, Sodium Silicates, Potassium Silicates, Silicas, Magnesium Silicate, Magnesium Sulfate, [ and Microspheres ]; [ Systems and Processes for Treatment of Industrial and Municipal Raw and Waste Water ]; [ Glass Products Including Spherodized and Coated Particles ]; Technical Assistance and Consulting Services Related to Use of Silicates, Water Treatment, and Other Chemical Products
HI-BUILT
HI-BUILT
Trademark
Word
Previous
CANCELLED
Owner:
Serial:73184332
Filed:Sep 1, 1978
Classes:3
Registration:1125117
Registered:Sep 18, 1979
Description: LAUNDRY SOAP CONTAINING INORGANIC BUILDER SALTS
Q-CEL
Q-CEL
Trademark
Word
Previous
REGISTERED
Owner:
Serial:72396277
Filed:Jun 21, 1971
Classes:1
Registration:0929404
Registered:Feb 22, 1972
Description: SODIUM SILICATE IN THE FORM OF HOLLOW SPHERES
BRITESIL
BRITESIL
Trademark
Word
Previous
REGISTERED
Owner:
Serial:72204945
Filed:Oct 28, 1964
Classes:1
Registration:0794289
Registered:Aug 17, 1965
Description: SODIUM SILICATE
KASIL
KASIL
Trademark
Stylized
Previous
REGISTERED
Owner:
Serial:71453165
Filed:May 21, 1942
Classes:1, 6
Registration:0398704
Registered:Nov 17, 1942
Description: Potassium Silicate, Either Anhydrous, Hydrous, Crystalline, Glassy or in Solution, or in Admixture with Other Alkaline Salts, Useful in the Manufacture of Gels, Cements, Coatings, Detergents, and the Like
PYRAMID
PYRAMID
Trademark
Combined
Previous
EXPIRED
Owner:
Serial:70029135
Filed:Oct 15, 1896
Classes:6, 32
Registration:0029135
Registered:Nov 10, 1896
Description: [ CAUSTIC SODA AND SILICATE OF SODA ] * SODIUM HYDROXIDE AND SODIUM SILICATE *