Granted Patent
Utility
US 4,643,635 · App. 06/626,934
Vapor core centrifugal pump having main and low flow impellers
Inventor:
Frank A. Leachman, Jr.
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Jul 2, 1984
Inventor
Frank A. Leachman, Jr.
Assignee (at issue)
Chandler Evans 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.