Granted Patent
Utility
US 5,229,431 · App. 07/918,356
Crack-resistant polycarbonate urethane polymer prostheses and the like
Inventor:
Leonard Pinchuk
Patented Case
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Granted: Jul 20, 1993
Filed: Jul 23, 1992
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.