Granted Patent
Utility
US 6,170,454 · App. 09/127,173
Piston apparatus and methods
Inventors:
James McFarland, Jack Dean Falkenrath
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Jul 31, 1998
Inventors
James McFarland
Jack Dean Falkenrath
Assignee (at issue)
Techniphase Industries, 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.