Granted Patent
Utility
US 4,827,686 · App. 07/093,675
Coated roofing membrane
Inventors:
Richard W. Stamper, Robert C. Hultz
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Sep 8, 1987
Inventors
Richard W. Stamper
Robert C. Hultz
Assignee (at issue)
GenCorp, Inc.
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.