IP Library › Granted Patent US 5,809,971
Granted Patent Utility
US 5,809,971 · App. 08/938,532

Engine air/fuel ratio control

Inventors: Ulf Svensson, Ulf Petersson
Patented Case View Patent ↗
Granted: Sep 22, 1998 Filed: Sep 26, 1997
Inventors
Ulf Svensson
Ulf Petersson
Assignee (at issue)
Aktiebolaget Electrolux

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 5,809,971
App. No.
08/938,532
Filed
1997-09-26
Granted
1998-09-22
Kind
A