Granted Patent
Utility
US 4,738,780 · App. 06/742,962
Method for replacing PCB-containing coolants in electrical induction apparatus with substantially PCB-free dielectric coolants
Inventor:
Gilbert R. Atwood
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Jun 10, 1985
Inventor
Gilbert R. Atwood
Assignee (at issue)
Union Carbide 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.