Granted Patent
Utility
US 4,521,151 · App. 06/545,106
Centrifugal slurry pump
Inventors:
John Semple Frater, David Pope
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Oct 24, 1983
Inventors
John Semple Frater
David Pope
Assignee (at issue)
Joy Manufacturing Company
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.