US4345459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensing device
Assignee: Emerson Electric Co
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Filing: 1980-10-17
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Granted: 1982-08-24
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Expires: 2000-10-17
Abstract
Abstract A device for sensing a substance on the surface of a liquid of the type including a float and a sensing element mounted on the float for extending into the liquid, includes a plastic encasement enclosing all portions of the element to be exposed to the liquid for preventing interference with the operation of the element by substances in the liquid other than the substance to be sensed.
Inventors
- 👤 Ralph A. Perry
- 👤 James M. Booe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/18; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/18; G01N33/00; G01N33/18; G01N33/1826; G01N33/1833
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
In a device for sensing a substance on the surface of a liquid of the type including a floatation means and a sensing element mounted on said floatation means for extending into said liquid, wherein the improvement comprises a plastic encasement enclosing all portions of said element to be exposed to said liquid for preventing interference with the operation of said element by substances in said liquid other than first said substance.
Claim 2
Dependent Claim
72 words
In a device for sensing a substance on the surface of a liquid of the type including a floatation means and a sensing element mounted on said floatation means for extending into said liquid, wherein the improvement comprises a plastic encasement enclosing all portions of said element to be exposed to said liquid for preventing interference with the operation of said element by substances in said liquid other than first said substance.
Claim 3
Dependent Claim
33 words
In the device of claim 1, wherein said sensing element is an axially leaded semiconductor junction device, said plastic encasement includes shrink tubing having a wall thickness of approximately 0.015 inches or less.
Claim 4
Dependent Claim
40 words
In the device of claim 2, wherein said sensing element has leads extending into said floatation means for mounting said sensing element thereto, the improvement further comprising epoxy resin material located for sealing said shrink tubing to said floatation means.
Claim 5
Dependent Claim
19 words
In the device of claim 3, wherein said floatation means includes a recess for containing said epoxy resin material.
Claim 6
Dependent Claim
14 words
In the device of claim 1, wherein said plastic encasement includes polyolefin shrink tubing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |