Granted Patent
Utility
US 4,655,842 · App. 06/764,910
Vermiculite dispersions and method of preparing same
Inventors:
Chia-Chih Ou, Julie Yang
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Aug 12, 1985
Inventors
Chia-Chih Ou
Julie Yang
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.