Granted Patent
Utility
US 4,401,746 · App. 06/381,437
Stripping layer consisting of a mixture of cellulose acetate hydrogen phthalate and straight chain saturated polyester of adipic acid
Inventor:
William J. Pfingston
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: May 24, 1982
Inventor
William J. Pfingston
Assignee (at issue)
Polaroid Corporation
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.