U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Did You Know...

...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?

Newsletter  PatentStorm News

Make the Most of PatentStorm

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest patents by subscribing to an RSS feed.

Got questions? Ask a Patent Expert!

Registered users: Manage your profile, comments and alerts.

 

US Patent 4272329 - Steady state mode oxygen sensor and method

US Patent Issued on June 9, 1981
Estimated Patent Expiration Date: Icon_subject March 3, 2000Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
loading...


View Patent Images (PDF)
(Registered users only)

Abstract

This specification discloses a device to determine the percentage of oxygen in an ambient atmosphere. The device, which is immersed in the atmosphere, is constructed to define an enclosed volume in which the atmosphere can be established by means of a small leak. The enclosing structure contains two partitions which can conduct oxygen ions and act as electrochemical cells. One partition is called the pump cell while the other is called the sensor cell. When attached to an external power supply, the current (Ip) drawn through the pump cell either adds or removes (from or to the ambient) gaseous oxygen from the volume. As a result of the pumping action, an EMF (VS) develops across the sensor cell which can be used to measure the change in oxygen partial pressure in the volume relative to the ambient. If an external circuit causes adequate current to flow in the pump cell to keep the sensor EMF at a constant value, then the magnitude of the current is linearly proportional to the percentage of oxygen in the atmosphere.

Inventors

Assignee

Application

No. 06/126606 filed on 03/03/1980

US Classes:

205/785, With heating or temperature sensing204/406, With significant electrical circuitry or nominal computer device204/412, Three or more electrodes204/425, With impressed current means204/426, Planar electrode surface205/784, Gaseous oxygen or oxygen containing compound60/276Having means analyzing composition of exhaust gas

Examiners

Primary: Kaplan, G. L.

Attorney, Agent or Firm

US Patent References

3514377, 3562521, 3699032, 3738341, 3948081, Exhaust gas operated apparatus for continuously measuring air number of engine intake mixture
Issued on: 04/06/1976
Inventor: Wessel ,   et al.
4066528, Analytical apparatus
Issued on: 01/03/1978
Inventor: Mansfield
4111776, Analytical apparatus and processes
Issued on: 09/05/1978
Inventor: Mansfield
4112893, Air/fuel ratio control system for internal combustion engine having high input impedance circuit
Issued on: 09/12/1978
Inventor: Anzai
4158166, Combustibles analyzer
Issued on: 06/12/1979
Inventor: Isenberg
4169440Cruise economy system
Issued on: 10/02/1979
Inventor: Taplin ,   et al.

International Class

G01N 27/406 (20060101)

Comments

No comments for this page
 
 
Forgot password?
Register here