Granted Patent
Utility
US 4,173,612 · App. 05/848,439
Extrusion process for thermoplastic rubber film
Inventor:
William G. F. Kelly
Patented Case
View Patent ↗
Granted: Nov 6, 1979
Filed: Nov 3, 1977
Inventor
William G. F. Kelly
Assignee (at issue)
Johnson & Johnson GmbH
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.