Granted Patent
Utility
US 4,243,093 · App. 05/852,378
Method of making an insulated manifold with double cast walls
Inventor:
John R. Nieman
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Nov 17, 1977
Inventor
John R. Nieman
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.