Granted Patent
Utility
US 4,212,337 · App. 05/892,432
Closure fastening device
Inventor:
Ewald A. Kamp
Patented Case
View Patent ↗
Granted: Jul 15, 1980
Filed: Mar 31, 1978
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.