Granted Patent
Utility
US 3,973,429 · App. 05/595,649
Test apparatus for engine heads
Inventors:
Virgil R. C. Durgan, Milton J. Palma
Patented Case
View Patent ↗
Granted: Aug 10, 1976
Filed: Jul 14, 1975
Inventors
Virgil R. C. Durgan
Milton J. Palma
Assignee (at issue)
Caterpillar Tractor 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.