Granted Patent
Utility
US 4,297,987 · App. 06/038,089
Heat exchange system
Inventor:
Lawrence C. Bushee
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: May 11, 1979
Inventor
Lawrence C. Bushee
Assignee (at issue)
Amana Refrigeration, 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.