Granted Patent
Utility
US 4,590,771 · App. 06/736,899
Control system for defrosting the outdoor coil of a heat pump
Inventors:
Jacob E. Shaffer, Jr., Wayne D. Dellinger, James R. Harnish
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: May 22, 1985
Inventors
Jacob E. Shaffer, Jr.
Wayne D. Dellinger
James R. Harnish
Assignee (at issue)
BorgWarner 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.