Granted Patent
Utility
US 4,522,370 · App. 06/437,172
Valve
Inventors:
Timothy J. Noack, Lester C. Rathie
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Oct 27, 1982
Inventors
Timothy J. Noack
Lester C. Rathie
Assignee (at issue)
Otis Engineering 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.