Granted Patent
Utility
US 4,682,679 · App. 06/835,732
Viscous drive with variable pump action
Inventor:
Arthur E. H. Elmer
Patented Case
View Patent ↗
Granted: Jul 28, 1987
Filed: Mar 3, 1986
Inventor
Arthur E. H. Elmer
Assignee (at issue)
KYSOR INDUSTRIAL 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.