Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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:
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.
Estimated Patent Expiration Date:
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.AbstractThis 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. | InventorsAssigneeApplicationNo. 06/126606 filed on 03/03/1980US 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 gasExaminersPrimary: Kaplan, G. L.Attorney, Agent or FirmUS Patent References3514377, 3562521, 3699032, 3738341, 3948081, Exhaust gas operated apparatus for continuously measuring air number of engine intake mixtureIssued on: 04/06/1976 Inventor: Wessel , et al.4066528, Analytical apparatus Issued on: 01/03/1978 Inventor: Mansfield4111776, Analytical apparatus and processes Issued on: 09/05/1978 Inventor: Mansfield4112893, Air/fuel ratio control system for internal combustion engine having high input impedance circuit Issued on: 09/12/1978 Inventor: Anzai4158166, Combustibles analyzer Issued on: 06/12/1979 Inventor: Isenberg4169440Cruise economy system Issued on: 10/02/1979 Inventor: Taplin , et al. International ClassG01N 27/406 (20060101) |
