Granted Patent
Utility
US 6,164,937 · App. 09/331,371
Compressor provided with an improved piston
Inventor:
Rudolf Lang
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Jun 18, 1999
Inventor
Rudolf Lang
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.