Granted Patent
Utility
US 4,579,823 · App. 06/536,290
Sterilization indicator
Inventor:
Francis E. Ryder
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Sep 27, 1983
Inventor
Francis E. Ryder
Assignee (at issue)
RYDER INTERNATIONAL CO., LTD.
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.