Granted Patent
Utility
US 4,516,268 · App. 06/518,537
Pentabar closure device
Inventor:
Ewald A. Kamp
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Jul 29, 1983
Inventor
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.