Granted Patent
Utility
US 4,816,339 · App. 07/043,326
Multi-layered poly(tetrafluoroethylene)/elastomer materials useful for in vivo implantation
Inventors:
Roger Tu, Edwin Wang
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Apr 28, 1987
Inventors
Roger Tu
Edwin Wang
Assignee (at issue)
Baxter International Inc.
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.