Granted Patent
Utility
US 4,692,489 · App. 06/762,904
Polypropylene compositions of improved clarity
Inventors:
Harold K. Ficker, Frederick M. Teskin
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Aug 6, 1985
Inventors
Harold K. Ficker
Frederick M. Teskin
Assignee (at issue)
El Paso Products Company
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.