Granted Patent
Utility
US 4,477,950 · App. 06/444,979
Closure
Inventors:
Kenneth E. Cisek, Ewald A. Kamp
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Nov 29, 1982
Inventors
Kenneth E. Cisek
Ewald A. Kamp
Assignee (at issue)
Union Carbide 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.