Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply and sanitary purposes.
Trademark applications and registrations in Class 11 over the past 15 years.
Class 11 covers apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply, and sanitary purposes. It is a high-volume class serving the HVAC, plumbing, lighting, kitchen appliance, and water treatment industries. The class's breadth — from LED light bulbs to industrial water purification systems — makes it relevant to both consumer product brands and commercial equipment manufacturers.
The top filing entities — Overseas Operation Services (Flatfee Corp), Muncy Geissler Olds & Lowe, and Di Li Law — reflect the class's appeal to both high-volume consumer brands and specialized industrial equipment manufacturers. The smart home revolution has driven significant recent filing activity, as traditional lighting and HVAC products gain connected features and new market entrants launch IoT-enabled home climate and water systems.
The most frequently contested classification boundary in Class 11 involves Class 7 and Class 9. The rule for kitchen appliances is functional: if the appliance primarily uses heat or cold to process food (ovens, toasters, refrigerators), it belongs in Class 11; if it mechanically processes food (blenders, food processors), it belongs in Class 7. The Class 9 boundary is equally important: electronic control panels and sensors are Class 9, but the heating, cooling, or lighting apparatus they control is Class 11. Smart thermostats present a recurring gray area — the thermostat as a control device may implicate Class 9, while the HVAC system it governs is clearly Class 11. Water filtration systems and purifiers are Class 11, but chemical water treatment preparations are Class 1.
Home appliance brands typically file across Classes 7, 9, 11, and 21, covering mechanical appliances, electronic components, heating and cooling apparatus, and household containers. Commercial HVAC companies pair Class 11 with Class 37 for installation and repair services. Plumbing fixture manufacturers often add Class 6 for metal fittings and Class 20 for non-metal bathroom accessories. The intersection of Class 11 with smart home technology makes multi-class filings including Class 9 and Class 42 increasingly standard.
Class 11 includes mainly environmental control apparatus and installations, in particular, for the purposes of lighting, cooking, cooling and sanitizing.
| # | Firm | Total |
|---|---|---|
| 1 | Overseas Operation Services, Inc. DBA Flatfee Corp. | 1,995 |
| 2 | Muncy, Geissler, Olds & Lowe, P.C. | 1,420 |
| 3 | TIANYU LAW GROUP, INC. | 1,338 |
| 4 | MASCO CORPORATION | 1,276 |
| 5 | DI LI LAW, P.C. | 1,252 |
| 6 | PATTISHALL, MCAULIFFE, NEWBURY, HILLIARD & GERALDS | 1,238 |
| 7 | Birch, Stewart, Kolasch & Birch, LLP | 1,114 |
| 8 | Kunzler Bean & Adamson | 1,083 |
| 9 | Ni, Wang & Massand, PLLC | 1,063 |
| 10 | Usa | 1,027 |
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Explore 153,888 live trademarks in HVAC, Lighting & Kitchen Appliances. Search by name, owner, or serial number — then filter by Class 11.
Search TrademarksCooking appliances that heat, cool, or process food (ovens, microwaves, refrigerators, toasters) belong in Class 11. Kitchen machines that mechanically process food (blenders, food processors, mixers) belong in Class 7.
Yes. Lighting apparatus and installations, including light bulbs, lamps, chandeliers, and lamp shades, are all classified in Class 11.
Yes. Humidifiers, dehumidifiers, and air purifiers fall under Class 11 as apparatus for ventilation and air treatment purposes.
Smart thermostats are a gray area. The thermostat as an electronic control device may be filed in Class 9, but the HVAC system it controls is Class 11. Many smart home brands file in both classes to cover the device and the climate-control functionality.
No. Electric vehicle charging stations and chargers are classified in Class 9 as electrical apparatus. Class 11 covers heating, lighting, and cooking equipment, not battery charging devices.
Yes. LED light strips, smart bulbs, and all lighting apparatus belong in Class 11 regardless of whether they have electronic connectivity features. The lighting function determines the classification.
The most common mistake is filing kitchen machines like blenders and food processors in Class 11 instead of Class 7. Class 11 only covers appliances that use heat, cold, or steam to process food (ovens, refrigerators, toasters). Mechanical food processing machines belong in Class 7.
Water filtration and purification apparatus belongs in Class 11. However, a simple non-filtering pitcher is Class 21 (household utensils). The filtration function is what places the product in Class 11.
Yes. Home appliance brands typically need Classes 7 (mechanical appliances), 9 (electronic controls and apps), 11 (heating, cooling, and lighting), and 21 (non-electric household items). Filing in only one class leaves significant gaps in protection.