Granted Patent
Utility
US 4,249,863 · App. 06/028,527
Surface aerator impeller
Inventors:
John R. Connolly, David E. Gibson, Edward L. Heimark, Jerome B. Quinn, Richard E. Speechley, Richard L. Winter
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Apr 9, 1979
Inventors
John R. Connolly
David E. Gibson
Edward L. Heimark
Jerome B. Quinn
Richard E. Speechley
Richard L. Winter
Assignee (at issue)
Philadelphia Gear Corporation
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.