Granted Patent
Utility
US 4,203,883 · App. 05/939,667
Aqueous colloidal dispersions of tertiary amine salts of urea-urethane polymers and method for manufacture
Inventor:
David G. Hangauer, Jr.
Patented Case
View Patent ↗
Granted: May 20, 1980
Filed: Sep 5, 1978
Inventor
David G. Hangauer, Jr.
Assignee (at issue)
Textron 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.