Granted Patent
Utility
US 4,295,284 · App. 06/054,861
Dryer range
Inventor:
Philip M. Witkin
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Jul 5, 1979
Inventor
Philip M. Witkin
Assignee (at issue)
Marshall and Williams 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.