Granted Patent
Utility
US 4,332,619 · App. 06/206,507
Expansive admixture
Inventors:
Richard G. Gandy, Garry L. Briggs
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Nov 13, 1980
Inventors
Richard G. Gandy
Garry L. Briggs
Assignee (at issue)
BJ-Hughes Inc.
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.