Granted Patent
Utility
US 4,304,677 · App. 05/939,509
Method of servicing wellbores
Inventors:
Randall C. Stauffer, Andrew J. Pasztor, Jr.
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Sep 5, 1978
Inventors
Randall C. Stauffer
Andrew J. Pasztor, Jr.
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.