Granted Patent
Utility
US 4,882,908 · App. 07/074,907
Demand defrost control method and apparatus
Inventor:
Lee A. White
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Jul 17, 1987
Inventor
Lee A. White
Assignee (at issue)
RANCO CO., Ltd.
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.