SAN FRANCISCO — If there is one thing Raj Abhyanker can’t stand, it’s stability.

The entrepreneur shook up the field of trademark law in 2009 by launching Trademarkia, a website that lets users comb through more than a century’s worth of records from the U.S. Patent and Trademark Office and then apply for their own trademarks. The site has brought 24,000 active clients to his law firm, LegalForce RAPC Worldwide, which filed 12,000 trademarks worldwide last year — more than any other firm.