Granted Patent
Utility
US 4,725,671 · App. 06/825,812
Collagen membranes for medical use
Inventors:
George H. Chu, John R. Daniels
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Feb 4, 1986
Inventors
George H. Chu
John R. Daniels
Assignee (at issue)
COLLAGEN 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.