Granted Patent
Utility
US 6,553,893 · App. 09/817,435
Piston assembly for reducing the temperature of a compressor cup seal
Inventor:
Robert W. Murdoch
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Mar 26, 2001
Inventor
Robert W. Murdoch
Assignee (at issue)
Respironics, 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.