Granted Patent
Utility
US 4,564,045 · App. 06/621,608
Reversing valve construction and method of making the same
Inventors:
Rudolf Koch, Octavio F. Affonso
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Jun 18, 1984
Inventors
Rudolf Koch
Octavio F. Affonso
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.