Granted Patent
Utility
US 4,340,693 · App. 06/197,863
Titanoborate glass as cross-linking agent in polycarboxylic acid cements
Inventors:
Cyril F. Drake, Francesca M. Shreeve
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Oct 17, 1980
Inventors
Cyril F. Drake
Francesca M. Shreeve
Assignee (at issue)
International Standard Electric 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.