Granted Patent
Utility
US 4,575,317 · App. 06/749,066
Constant clearance positive displacement piston pump
Inventor:
George H. Lindner
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Jun 26, 1985
Inventor
George H. Lindner
Assignee (at issue)
M&T Chemicals, 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.