Granted Patent
Utility
US 5,139,976 · App. 07/321,214
Cordierite composition and method of production
Inventors:
John F. Terbot, Richard F. Hill
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Mar 9, 1989
Inventors
John F. Terbot
Richard F. Hill
Assignee (at issue)
Union Carbide Coatings Service Technology 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.