Granted Patent
Utility
US 4,540,537 · App. 06/583,495
Method and extruding die apparatus for producing a plastic closure strip
Inventor:
Ewald A. Kamp
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Mar 1, 1984
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.