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Local sellers of medical marijuana see value in trademarking pot strains and problems

contracostatimes.com — Marin County's doyen of medical marijuana, Lynette Shaw, said she was pleased when she read recently on the Web that the U.S. Patent and Trademark Office had created a new trademark category for medical marijuana. But the patent office backpedaled last week and eliminated the category, which was established April 1, after an inquiry by the Wall Str