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Arnold Hoffman & Co Inc

Arnold Hof
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2824861A Quaternary compounds Expired / Lapsed 1955-05-19 1958-02-25 2 Details
US2638463A Polymers from pyrrolidone Expired / Lapsed 1951-12-07 1953-05-12 2 Details
US2501783A Water-soluble urea resins Expired / Lapsed 1946-05-09 1950-03-28 2 Details