Granted Patent
Utility
US 4,835,366 · App. 07/106,169
Portable temperature controlled floating electric immersion heater for a livestock water tank
Inventors:
Donald B. Owen, Kenneth D. Hartman
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Oct 7, 1987
Inventors
Donald B. Owen
Kenneth D. Hartman
Assignee (at issue)
Allied Precision Industries 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.