Granted Patent
Utility
US 4,723,894 · App. 06/937,217
Low-pressure air pump
Inventor:
Howard B. Marx
Patented Case
View Patent ↗
Granted: Feb 9, 1988
Filed: Dec 3, 1986
Inventor
Howard B. Marx
Assignee (at issue)
Transamerica DeLaval 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.