Granted Patent
Utility
US 4,271,976 · App. 06/093,453
Combination pressure release cooling cap and recovery of coolant
Inventor:
Timothy P. Detwiler
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Nov 13, 1979
Inventor
Timothy P. Detwiler
Assignee (at issue)
E. Edelmann & Co.
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.