Granted Patent
Utility
US 5,137,530 · App. 07/546,252
Collagen treatment apparatus
Inventor:
Bruce J. Sand
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Jun 29, 1990
Inventor
Bruce J. Sand
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.