Granted Patent
Utility
US 4,780,147 · App. 07/027,713
Vermiculite dispersions and method of preparing same
Inventors:
Chia-Chih Ou, Albert N. Crawford
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Mar 19, 1987
Inventors
Chia-Chih Ou
Albert N. Crawford
Assignee (at issue)
W. R. Grace & Co.
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.