Granted Patent
Utility
US 5,182,033 · App. 07/715,381
Polyamide salts
Inventor:
Robert K. Lagerman
Patented Case
View Patent ↗
Granted: Jan 26, 1993
Filed: Jun 14, 1991
Inventor
Robert K. Lagerman
Assignee (at issue)
Sherex Chemical Co., Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.