Granted Patent
Utility
US 4,754,895 · App. 06/868,644
Drain closure
Inventors:
George E. Lardner, Jacek M. Weinheimer
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: May 29, 1986
Inventors
George E. Lardner
Jacek M. Weinheimer
Assignee (at issue)
Halkey-Roberts 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.