Granted Patent
Utility
US 4,852,629 · App. 07/195,562
Cold-box process for forming foundry shapes which utilizes certain carboxylic acids as bench life extenders
Inventors:
Robert B. Fechter, John J. Gardikes
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: May 16, 1988
Inventors
Robert B. Fechter
John J. Gardikes
Assignee (at issue)
Ashland Oil, Inc.
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.