Granted Patent
Utility
US 4,245,939 · App. 05/969,164
Method and apparatus for machining spherical combustion chambers
Inventor:
Leonard Sear
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Dec 13, 1978
Inventor
Leonard Sear
Assignee (at issue)
F. Jos. Lamb Company
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.