Granted Patent
Utility
US 4,220,906 · App. 05/785,836
Dielectric thermal power converter
Inventor:
James E. Drummond
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: Apr 8, 1977
Inventor
James E. Drummond
Assignee (at issue)
Maxwell Laboratories, 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.