Granted Patent
Utility
US 4,282,925 · App. 06/134,266
Scraped surface heat exchanger
Inventors:
Lloyd F. Hay, Albert F. Rica, J. R. Webber
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Mar 26, 1980
Inventors
Lloyd F. Hay
Albert F. Rica
J. R. Webber
Assignee (at issue)
FranRica Mfg. 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.