Granted Patent
Utility
US 4,969,495 · App. 07/371,785
Direct condensation refrigerant recovery and restoration system
Inventor:
David. C. H. Grant
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Jun 27, 1989
Inventor
David. C. H. Grant
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.