Granted Patent
Utility
US 4,248,052 · App. 05/957,590
Flow sensor and defrost system including same
Inventor:
Jon H. Bechtel
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Nov 3, 1978
Inventor
Jon H. Bechtel
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.