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WALTHER H DUISBERG

WALTHER H
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2297613A Process of producing viscose rayon Expired / Lapsed 1939-11-01 1942-09-29 0 Details
US2261313A Process for uniting materials of polymerized vinylchloride … Expired / Lapsed 1939-04-13 1941-11-04 0 Details
US2231497A Apparatus for producing a continuous sliver composed of ray… Expired / Lapsed 1938-09-21 1941-02-11 0 Details