Granted Patent
Utility
US 4,377,645 · App. 06/314,537
Dimensionally-stable polyurethane sponge and sponge-forming prepolymer
Inventors:
James L. Guthrie, Suze E. Arquette
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Oct 26, 1981
Inventors
James L. Guthrie
Suze E. Arquette
Assignee (at issue)
W. R. Grace & Co.
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.