Aspartic acid copolymers and their preparation

Dec 22, 1997 - Donlar Corporation

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Claims

Referenced Cited

U.S. Patent Documents

2306918	December 1942	Weiss et al.
3846380	November 1974	Fujimoto et al.
5292858	March 8, 1994	Wood
5357004	October 18, 1994	Calton et al.
5408028	April 18, 1995	Wood et al.

Patent History

Patent number: RE36234
Type: Grant
Filed: Dec 22, 1997
Date of Patent: Jun 22, 1999
Assignee: Donlar Corporation (Bedford Park, IL)
Inventors: Larry P. Koskan (Orland Park, IL), James F. Kneller (LaGrange Park, IL), Daniel A. Batzel (Skokie, IL)
Primary Examiner: P. Hampton-Hightower
Law Firm: Olson & Hierl, Ltd.
Application Number: 8/995,444

Classifications

Current U.S. Class: With Nitrogen-containing Reactant (528/363); From N-c-(c=o)-oh Containing Reactant Or Acid Derivative Thereof, E.g., Alpha Amino Acid, Etc. (528/328); With Organic Amine, Or From Organic Amine Salt Of A Carboxylic Acid (528/332); From Dicarboxylic Acid Or Derivative Thereof And An Organic Amine, Or From An Organic Amine Salt Of A Dicarboxylic Acid (528/335); Ethylenically Unsaturated Reactant (528/345); Solid Polymer Derived From At Least One Carboxylic Acid Or Derivative (525/418); Solid Polymer Derived From At Least One Lactam; From An Amino Carboxylic Acid Or Derivative; Or From A Polycarboxylic Acid Or Derivative (525/419); Solid Polymer Derived From An Amino Carboxylic Acid Or Derivative; From A Polyamine And A Polycarboxylic Acid Or Derivative; From At Least One Lactam; Or From A Polyamine Salt Of A Polycarboxylic Acid (525/420)
International Classification: C08G 6948;