Granted Patent
Utility
US 4,352,287 · App. 05/162,137
Rotational viscometer
Inventors:
Heinz W. Orth, James W. Sloot
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Jun 23, 1980
Inventors
Heinz W. Orth
James W. Sloot
Assignee (at issue)
Dresser Industries, 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.