Granted Patent
Utility
US 4,359,384 · App. 06/213,822
Self-locking filter valve
Inventors:
Earl P. Brane, Douglas K. Brane, Hilton H. Hammond
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Dec 8, 1980
Inventors
Earl P. Brane
Douglas K. Brane
Hilton H. Hammond
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.