Granted Patent
Utility
US 4,585,682 · App. 06/497,451
Roofing membranes
Inventors:
Peter C. Colarusso, Bahram Siadat
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: May 23, 1983
Inventors
Peter C. Colarusso
Bahram Siadat
Assignee (at issue)
W. R. Grace & Co.
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.