Granted Patent
Utility
US 4,336,442 · App. 06/224,608
Combination radiation and convection heater with convection current directing means
Inventor:
Eugene W. Starr
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Jan 12, 1981
Inventor
Eugene W. Starr
Assignee (at issue)
PPG Industries, 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.