Granted Patent
Utility
US 4,708,589 · App. 06/910,806
Roll-formed submersible pump
Inventors:
Darryl N. Nielsen, Charles F. Wheeler
Patented Case
View Patent ↗
Granted: Nov 24, 1987
Filed: Sep 22, 1986
Inventors
Darryl N. Nielsen
Charles F. Wheeler
Assignee (at issue)
The Marley-Wylain 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.