Granted Patent
Utility
US 4,776,369 · App. 07/017,624
Check valve having snap-on clamping sleeve
Inventors:
George E. Lardner, Glenn H. Mackal
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Feb 24, 1987
Inventors
George E. Lardner
Glenn H. Mackal
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.