Granted Patent
Utility
US 4,346,751 · App. 05/836,376
Foundry molds
Inventor:
Earl E. Frank
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Sep 26, 1977
Inventor
Earl E. Frank
Assignee (at issue)
Abex Corporation
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.