Granted Patent
Utility
US 4,919,285 · App. 07/192,564
Tamper evident closure and method of manufacture of the same
Inventors:
William M. Roof, Eric Jason Roberts, Dennis P. Blair
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: May 11, 1988
Inventors
William M. Roof
Eric Jason Roberts
Dennis P. Blair
Assignee (at issue)
Thoroughbred Plastics Corp.
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.