IP Library › Granted Patent US 4,426,604
Granted Patent Utility
US 4,426,604 · App. 06/244,980

Direct current fan with control means

Inventors: Benno Doemen, Rolf Muller
Patented Case View Patent ↗
Granted: Jan 17, 1984 Filed: Mar 18, 1981
Inventors
Benno Doemen
Rolf Muller

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,426,604
App. No.
06/244,980
Filed
1981-03-18
Granted
1984-01-17
Kind
A