Granted Patent
Utility
US 4,320,566 · App. 06/155,342
Method of retrofitting a heat exchanger
Inventors:
Robert C. Boyer, George J. Williams, Herbert A. Wessner
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: Jun 2, 1980
Inventors
Robert C. Boyer
George J. Williams
Herbert A. Wessner
Assignee (at issue)
Ecolaire Incorporated
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.