Granted Patent
Utility
US 4,775,776 · App. 06/880,798
Multi stage heater
Inventors:
Armin Rahn, Sabi Avramescu, Marcel Drouin
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Jul 1, 1986
Inventors
Armin Rahn
Sabi Avramescu
Marcel Drouin
Assignee (at issue)
Electrovert Ltd.
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.