Granted Patent
Utility
US 4,756,438 · App. 07/063,206
Container with threaded closure and tamper-evident feature
Inventor:
Geoffrey A. Ryder
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Jun 17, 1987
Inventor
Geoffrey A. Ryder
Assignee (at issue)
W. R. Grace & Co.
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.