Granted Patent
Utility
US 4,245,573 · App. 05/972,276
Air heater corrosion prevention
Inventors:
Shyam N. S. Dixit, Douglas I. Bain, David A. Carter
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Dec 22, 1978
Inventors
Shyam N. S. Dixit
Douglas I. Bain
David A. Carter
Assignee (at issue)
Chemed 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.