Granted Patent
Utility
US 3,977,467 · App. 05/502,647
Air conditioning module
Inventor:
Leonard L. Northrup, Jr.
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Sep 3, 1974
Inventor
Leonard L. Northrup, Jr.
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.