Granted Patent
Utility
US 6,668,571 · App. 09/980,998
Refrigerant compressor driven by variable supply frequency motor
Inventors:
Tiziano Bertotti, Fabrizio Carli, Roberto Peruzzo
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Feb 12, 2002
Inventors
Tiziano Bertotti
Fabrizio Carli
Roberto Peruzzo
Assignee (at issue)
Zanussi Elettromeccanica S.p.A.
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.