Granted Patent
Utility
US 4,374,178 · App. 06/220,280
Silanated calcium carbonate fillers
Inventors:
Ravindra D. Kulkarni, Errol D. Goodard
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Dec 29, 1980
Inventors
Ravindra D. Kulkarni
Errol D. Goodard
Assignee (at issue)
Union Carbide 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.