Granted Patent
Utility
US 4,602,655 · App. 06/450,453
Self-retaining check valve and mounting therefor
Inventor:
Glenn H. Mackal
Patented Case
View Patent ↗
Granted: Jul 29, 1986
Filed: Dec 16, 1982
Inventor
Glenn H. Mackal
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.