Granted Patent
Utility
US 4,252,133 · App. 05/888,214
Vapor exchange
Inventors:
Walter E. Buske, Charles W. Hoyt, Albert A. Thompson
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Mar 20, 1978
Inventors
Walter E. Buske
Charles W. Hoyt
Albert A. Thompson
Assignee (at issue)
Wolverine Corporation
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.