Cristina N. Rubke
Cristina N. Rubke is a USPTO correspondent of record based in San Francisco, California, listed on 817 trademark filings (494 currently live). The correspondent has worked across 191 distinct trademark owners — a mid-breadth client roster at roughly 4.3 marks per client. In TTAB matters, Cristina N. Rubke is attorney of record on 20 contested oppositions and cancellations, more often as plaintiff (11) than defendant (9). The correspondent is associated with SHARTSIS FRIESE LLP.
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Editorial deep dives on prosecution strategy, TTAB, and brand portfolios
Class 42 Filings Up 32% Year Over Year as September 2026 Tops September 2025
Counting applications filed directly with the USPTO, Class 42 filings rose 32.4% from September 2025 to 6,629, and total U.S.-direct applications reached 55,636, up 3.2% from a year earlier.
TTAB in Q3 2026: Contested Filings Rise 3.9% While Defaults End 56% of Oppositions
Oppositions and cancellations filed at the TTAB rose 3.9% to 3,044 in Q3 2026. Of the 2,937 that ended during the quarter, 1,636 (55.7%) ended in default because the respondent never answered.
How the Thirteen du Pont Factors Actually Get Weighed
The thirteen factors were never a scoring rubric: two keystones decide most cases, any single factor can end one, and the rest move only when someone pays to put evidence in. The finale of our thirteen-part series, with the scoreboard of every case it covered.