Granted Patent
Utility
US 4,856,286 · App. 07/240,418
Refrigeration compressor driven by a DC motor
Inventors:
Louis Sulfstede, Robert W. Helt, Thomas Jensen
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Sep 1, 1988
Inventors
Louis Sulfstede
Robert W. Helt
Thomas Jensen
Assignee (at issue)
American Standard 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.