US5218304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic pH and ORP indicator
Assignee: Monsanto Co
•
Filing: 1992-03-06
•
Granted: 1993-06-08
•
Expires: 2012-03-06
Abstract
Abstract A sensor which may be immersed in a fluid to measure the pH and the ORP potential of the fluid is taught. The sensor has three solid state electrodes, a pH sensing electrode, a reference electrode and an ORP potential sensing electrode, which extend from a fluid-tight enclosure. The enclosure further contains a display means for indicating the pH measurement and the ORP potential measurement.
Inventors
- 👤 Patrick J. Kinlen
- 👤 John H. Wagenknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4166; C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F2103/00; C02F2103/42; C02F2209/00; C02F2209/04; C02F2209/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
73 words
A sensor for measuring the pH and the oxidation-reduction potential of a fluid comprising a first, a second and a third solid state electrode, said first electrode being a pH sensing electrode, said second electrode being a reference electrode for said first and third electrodes and said third electrode being an oxidation-reduction potential sensing electrode, said electrodes extending from a fluid-tight enclosure having display means for indicating said pH and oxidation-reduction potential measurement.
Claim 2
Dependent Claim
73 words
A sensor for measuring the pH and the oxidation-reduction potential of a fluid comprising a first, a second and a third solid state electrode, said first electrode being a pH sensing electrode, said second electrode being a reference electrode for said first and third electrodes and said third electrode being an oxidation-reduction potential sensing electrode, said electrodes extending from a fluid-tight enclosure having display means for indicating said pH and oxidation-reduction potential measurement.
Claim 3
Dependent Claim
30 words
The sensor of claim 1 wherein said first electrode is a solid state metal/metal oxide pH sensing electrode and said second electrode is a solid state metal/metal salt reference electrode.
Claim 4
Dependent Claim
30 words
The sensor of claim 2 wherein said first electrode is a solid state iridium/iridium oxide pH measurement electrode and said second electrode is a solid state silver/silver chloride reference electrode.
Claim 5
Dependent Claim
19 words
The sensor of claim 3 wherein said first and said second electrodes are coated with a perfluorocarbon polymer coating.
Claim 6
Dependent Claim
21 words
The sensor of claim 1 wherein said third electrode is a platinum electrode for measuring the oxidation-reduction potential of said fluid.
Claim 7
Dependent Claim
33 words
The sensor of claim 1 wherein said display means comprises a first light for indicating low pH, a second light for indicating high pH, and a third light for indicating low oxidation-reduction potential.
Claim 8
Dependent Claim
26 words
The sensor of claim 1 wherein said display means comprises a meter for indicating said pH measurement and a light for indicating said oxidation-reduction potential measurement.
Claim 9
Dependent Claim
14 words
The sensor of claim 1 wherein said display means comprises a liquid crystal display.
Claim 10
Dependent Claim
16 words
The sensor of claim 1 wherein said fluid-tight enclosure floats on the surface of said fluid.
Claim 11
Dependent Claim
14 words
The sensor of claim 1 wherein said fluid-tight enclosure is immersed in said fluid.
Claim 12
Dependent Claim
73 words
A sensor for measuring the pH and the chlorine content of a body of water comprising a first, a second and a third solid state electrode, said first electrode being a pH sensing electrode, said second electrode being a reference electrode for said first and third electrodes and said third electrode being a chlorine sensing electrode, said electrodes extending from a water-tight enclosure having display means for indicating said pH and chlorine measurement.
Claim 13
Dependent Claim
73 words
A sensor for measuring the pH and the chlorine content of a body of water comprising a first, a second and a third solid state electrode, said first electrode being a pH sensing electrode, said second electrode being a reference electrode for said first and third electrodes and said third electrode being a chlorine sensing electrode, said electrodes extending from a water-tight enclosure having display means for indicating said pH and chlorine measurement.
Claim 14
Dependent Claim
30 words
The sensor of claim 11 wherein said first electrode is a solid state metal/metal oxide pH sensing electrode and said second electrode is a solid state metal/metal salt reference electrode.
Claim 15
Dependent Claim
30 words
The sensor of claim 12 wherein said first electrode is a solid state iridium/iridium oxide pH measurement electrode and said second electrode is a solid state silver/silver chloride reference electrode.
Claim 16
Dependent Claim
19 words
The sensor of claim 13 wherein said first and said second electrodes are coated with a perfluorocarbon polymer coating.
Claim 17
Dependent Claim
23 words
The sensor of claim 11 wherein said third electrode is a platinum electrode for measuring the amount of chlorine present in the water.
Claim 18
Dependent Claim
33 words
The sensor of claim 11 wherein said display means comprises a first light for indicating low pH, a second light for indicating high pH, and a third light for indicating low chlorine content.
Claim 19
Dependent Claim
25 words
The sensor of claim 11 wherein said display means comprises a meter for indicating said pH measurement and a light for indicating said chlorine measurement.
Claim 20
Dependent Claim
14 words
The sensor of claim 11 wherein said display means comprises a liquid crystal display.
Claim 21
Dependent Claim
16 words
The sensor of claim 11 wherein said water-tight enclosure floats on the surface of said water.
Claim 22
Dependent Claim
14 words
The sensor of claim 11 wherein said water-tight enclosure is immersed in said water.
References Cited (Backward Citations)
US3959087A
Cited
US3726777A
Cited
US4028197A
Cited
US4033871A
Cited
US4090925A
Cited
DE2719015A1
Cited
US4176031A
Cited
DE2830313A1
Cited
US4224154A
Cited
US4338175A
Cited
DE3004494A1
Cited
FR2492531A1
Cited
US4442405A
Cited
US4825207A
Cited
US4657670A
Cited
US4801886A
Cited
US4940946A
Cited
US5103179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |