Granted Patent
Utility
US 4,735,838 · App. 06/817,647
Waterproof membrane
Inventors:
Michael G. Roberts, Charles E. Bolen, John L. Kane
Patented Case
View Patent ↗
Granted: Apr 5, 1988
Filed: Jan 10, 1986
Inventors
Michael G. Roberts
Charles E. Bolen
John L. Kane
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.