Granted Patent
Utility
US 5,458,252 · App. 08/253,541
Invertible, pressure-responsive sealing cap
Inventor:
Paul E. Logel
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Jun 3, 1994
Inventor
Paul E. Logel
Assignee (at issue)
American Precision Plastics 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.