Granted Patent
Utility
US 4,687,948 · App. 06/842,585
Dual mode controller for assigning operating priority of two loads
Inventor:
Robert W. Helt
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Mar 21, 1986
Inventor
Robert W. Helt
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.