Granted Patent
Utility
US 4,300,273 · App. 06/095,857
Method for making laminated spacer plate for engines
Inventor:
David A. Lockhart
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Nov 19, 1979
Inventor
David A. Lockhart
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.