Granted Patent
Utility
US 4,938,031 · App. 07/319,618
Refrigerant recovery and purification system
Inventors:
Kenneth W. Manz, Roger D. Shirley
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Mar 3, 1989
Inventors
Kenneth W. Manz
Roger D. Shirley
Assignee (at issue)
Kent-Moore 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.