Granted Patent
Utility
US 4,314,919 · App. 06/129,521
Method of thickening liquid polyester system with clay
Inventors:
Frank J. Washabaugh, William C. Goble
Patented Case
View Patent ↗
Granted: Feb 9, 1982
Filed: Mar 12, 1980
Inventors
Frank J. Washabaugh
William C. Goble
Assignee (at issue)
Engelhard Minerals & Chemicals 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.