IP Library › Granted Patent US 4,509,492
Granted Patent Utility
US 4,509,492 · App. 06/481,372

Diesel engine with EGR control

Inventors: Kouji Ochiai, Hitoshi Tomita
Patented Case View Patent ↗
Granted: Apr 9, 1985 Filed: Apr 1, 1983
Inventors
Kouji Ochiai
Hitoshi Tomita
Assignee (at issue)
Diesel Kiki Co., Ltd.

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 4,509,492
App. No.
06/481,372
Filed
1983-04-01
Granted
1985-04-09
Kind
A