US4388043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductivity dependent pump and process control
Assignee: TREVEX CORP
•
Filing: 1981-12-21
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Granted: 1983-06-14
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Expires: 2001-12-21
Abstract
Abstract Device for activating or inactivating a liquid pump on the basis of the electrical conductivity of a liquid. Device comprises, in combination, a housing having a passageway through which a liquid can flow, a pair of conductivity-sensing electrodes disposed near or in the passageway, means for connecting the passageway to a liquid pump, and means for connecting the electrodes to a conductivity-dependent pump activator connected to the pump. Device provides through-the-probe pumping and is adaptable for manual operation or in-line liquid control.
Inventors
- 👤 Gunther W. B. Preiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/06; F04B49/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A device for activating or inactivating a liquid pump on the basis of the electrical conductivity of a liquid, the device comprising, in combination, a housing having a passageway through which a liquid can flow, a pair of electrodes disposed about the passageway, means for connecting the passageway to a liquid pump and means for connecting the electrodes to a conductivity-dependent pump activation means in communication with the pump, the pair of electrodes comprising a generally tubular outer electrode coaxially disposed about a generally tubular inner electrode, the electrodes being separated by a liquid conductivity measuring chamber, and the inner electrode including an opening for initial liquid contact and an opening adapted to permit liquid communication through the tubular inner electrode and the conductivity measuring chamber.
Claim 2
Independent Claim
126 words
A device for activating or inactivating a liquid pump on the basis of the electrical conductivity of a liquid, the device comprising, in combination, a housing having a passageway through which a liquid can flow, a pair of electrodes disposed about the passageway, means for connecting the passageway to a liquid pump and means for connecting the electrodes to a conductivity-dependent pump activation means in communication with the pump, the pair of electrodes comprising a generally tubular outer electrode coaxially disposed about a generally tubular inner electrode, the electrodes being separated by a liquid conductivity measuring chamber, and the inner electrode including an opening for initial liquid contact and an opening adapted to permit liquid communication through the tubular inner electrode and the conductivity measuring chamber.
Claim 3
Dependent Claim
28 words
The device of claim 1 wherein the pair of electrodes and the passageway are adapted to permit substantially simultaneous initial contact with a liquid having a given conductivity.
Claim 4
Dependent Claim
40 words
The device of claim 1 wherein the liquid contacting surfaces area of the electrodes, in combination with the conductivity-dependent pump activation means, is sufficient to be electrically sensitive to liquids having an electrical conductivity of less than about 0.1 micromhos.
Claim 5
Dependent Claim
27 words
The device of claim 1 wherein the outer electrode is embedded in the housing and exposable to a liquid at a liquid probing portion of the device.
Claim 6
Dependent Claim
13 words
The device of claim 1 wherein the electrodes are removable from the housing.
Claim 7
Dependent Claim
43 words
The device of claim 1 wherein the (device is adapted to be manually operated) housing of the device has two end portions, a conductivity sensing end, and a handle end, the handle end comprising a portion of the external surface of the housing.
Claim 8
Dependent Claim
39 words
The device of claim 1 wherein the (device is adapted to form part of a continuous liquid flow monitoring system) housing includes a generally tubular passageway in which the electrical conductivity of a continuous liquid flow can be monitored.
References Cited (Backward Citations)
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GB1286628A
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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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |