Granted Patent
Utility
US 4,609,511 · App. 06/819,465
Release agent and process performable therewith for the production of polyurethane foam
Inventors:
Wolfgang Fischer, William P. Krug
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jan 15, 1986
Inventors
Wolfgang Fischer
William P. Krug
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.