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Patent applications and USPTO patent grants for Pfohl; Sigberg.The latest application filed is for "water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper".
Patent | Date |
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Water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper Grant 4,978,427 - Pfohl , et al. * December 18, 1 | 1990-12-18 |
Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper Grant 4,880,497 - Pfohl , et al. November 14, 1 | 1989-11-14 |
Production of paper and paperboard of high dry strength Grant 4,818,341 - Degen , et al. April 4, 1 | 1989-04-04 |
Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper Grant 4,774,285 - Pfohl , et al. September 27, 1 | 1988-09-27 |
Manufacture of paper having a high dry strength and a low wet strength Grant 4,294,873 - Hartmann , et al. October 13, 1 | 1981-10-13 |
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