Granted Patent
Utility
US 6,520,758 · App. 10/040,081
Screw compressor assembly and method including a rotor having a thrust piston
Inventor:
Brian D. Sowards
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Oct 24, 2001
Inventor
Brian D. Sowards
Assignee (at issue)
Ingersoll-Rand Company
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.