IP Library › Granted Patent US 4,895,489
Granted Patent Utility
US 4,895,489 · App. 07/111,774

Axial flow fan

Inventors: Yasuaki Kohama, Hideo Hirama, Takuzo Kanno, Takashi Ishida
Patented Case View Patent ↗
Granted: Jan 23, 1990 Filed: Oct 22, 1987
Inventors
Yasuaki Kohama
Hideo Hirama
Takuzo Kanno
Takashi Ishida

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 4,895,489
App. No.
07/111,774
Filed
1987-10-22
Granted
1990-01-23
Kind
A