Granted Patent
Utility
US 4,810,749 · App. 07/156,361
Polyurethanes
Inventor:
Leonard Pinchuk
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Feb 12, 1988
Inventor
Leonard Pinchuk
Assignee (at issue)
Corvita 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.