Granted Patent
Utility
US 4,686,137 · App. 06/612,365
Moisture vapor permeable materials
Inventors:
Robert S. Ward, Judy S. Riffle
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: May 21, 1984
Inventors
Robert S. Ward
Judy S. Riffle
Assignee (at issue)
Thoratec Laboratories Corporation
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.