Granted Patent
Utility
US 4,600,635 · App. 06/723,995
Bitumen adhesive and waterproofing membranes containing same
Inventors:
Robert A. Wiercinski, Stephen J. Whicher
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Apr 17, 1985
Inventors
Robert A. Wiercinski
Stephen J. Whicher
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.