PatentVote.com: Vote on your favourite invention!

Next ten patents ordered by date:
Radio control driving circuit device
Interactive projection display system
Interference canceling random access discrete address multiple access system
FM Radio ranging system
Apparatus for determining the direction of arrival of applied energy
Antenna coil and its support structure mounting
Method and apparatus for sorting and deflecting drops in an ink jet drop recorder
Circuit arrangement for temperature-dependent voltage regulation of piezo-electric recording nozzles in ink mosaic recording devices
Monolithic opto-isolator
Semiconductor timing device with radioactive material at the floating gate electrode of an insulated-gate field-effect transistor
Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh 

 

Title: Method and apparatus for sensing pressure

Abstract: A pressure sensing device has a light source, and an optical sensor for externally sensing a predetermined change in the pressure within a sealed system which has a conventional gauge. Illumination from the light source is reflected off of the gauge dial and detected by the optical sensor. When the pressure in the sealed system changes a predetermined amount, the needle on the gauge moves so as to interrupt the illumination reaching the optical sensor. The optical sensor in turn produces a voltage that can be used to turn on a light or other indicator.


Do you think this is a good invention? Vote now:

 Votes so far: For:(0) Against:(0)
Other info:


Inventors: Johnston, Max M. (Russellville, AR)

Application Number: 06/054420
Filing Date: 1979-07-03
Publication_date: 1981-06-23
Assignee: Polyvend

Primary Class(es): 340/688 250/231.110, 340/626, 73/705
Other Classes: G01D5/34; G01L19/12; G01D5/26; G01L19/00; G08B21/00
US Patent Ref:
2142602January, 1939Blethen250/231RPhotoelectric speed limit indicator
3363148January, 1968Freeman340/688Pointer-deflection instrument monitoring device
3633039January, 1972Herbstman et al.250/231RDISTURBANCE-SENSING DEVICE
3863067January, 1975Godley250/231RORIENTATION INDICATING APPARATUS

Other Refs: DE2454203GB1079495
May, 1976340/688
August, 1967340/688

Primary Examiner: Caldwell Sr., John W.
Assistant Examiner: Myer, Daniel
Attorney: Hill, Van Santen, Steadman, Chiara & Simpson
Claims: