Granted Patent
Utility
US 4,354,550 · App. 06/261,342
Heat transfer surface for efficient boiling of liquid R-11 and its equivalents
Inventors:
Robert J. Modahl, Virgil C. Luckeroth
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: May 7, 1981
Inventors
Robert J. Modahl
Virgil C. Luckeroth
Assignee (at issue)
The Trane Company
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.