Granted Patent
Utility
US 4,583,920 · App. 06/566,363
Positive displacement diaphragm pumps employing displacer valves
Inventor:
Georg H. Lindner
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Dec 28, 1983
Inventor
Georg 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.