US3980946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the electrical conductivity of a liquid
Assignee: Automobiles Citroen SA
•
Filing: 1975-04-04
•
Granted: 1976-09-14
•
Expires: 1995-04-04
Abstract
Abstract In apparatus for measuring the electrical resistance of a liquid employing two parallel channels for the liquid, a single induction coil is located at one of the points of connection of the channels and a single measuring coil at the other of said points of connection. In this way, parasitic electric circuits in the liquid and mutual interaction between the coils are avoided. The coils are preferably arranged coaxially above respective circular passages connecting the parallel channels.
Inventors
- 👤 Jacques Fleury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/22; G01N; G01N27/00; G01N27/02; G01N27/023
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
An apparatus for measuring the electrical conductivity of a liquid, comprising means having an inlet for said liquid, an outlet for said liquid and a pair of parallel channels independent from one another and interconnecting said inlet and said outlet; and an induction coil and a measuring coil, one of said coils being disposed at the junction of said channels with said inlet and the other of said coil being disposed at the junction of said channels with said outlet whereby said induction coil induces a current in said liquid through said channels and said measuring coil detects the current induced in said liquid at a location offset from said induction coil with respect to the direction of flow of said liquid from said inlet to said outlet.
Claim 2
Independent Claim
128 words
An apparatus for measuring the electrical conductivity of a liquid, comprising means having an inlet for said liquid, an outlet for said liquid and a pair of parallel channels independent from one another and interconnecting said inlet and said outlet; and an induction coil and a measuring coil, one of said coils being disposed at the junction of said channels with said inlet and the other of said coil being disposed at the junction of said channels with said outlet whereby said induction coil induces a current in said liquid through said channels and said measuring coil detects the current induced in said liquid at a location offset from said induction coil with respect to the direction of flow of said liquid from said inlet to said outlet.
Claim 3
Dependent Claim
26 words
The apparatus defined in claim 1 wherein said junctions are formed by respective passages extending along circular arcs, the respective coils being coaxial with said arcs.
Claim 4
Dependent Claim
37 words
The apparatus defined in claim 2 wherein said means forming said inlet, said outlet and said channels includes a plate provided with grooves constituting said inlet, said outlet and said channels, and a cover overlying said plate.
Claim 5
Dependent Claim
53 words
The apparatus defined in claim 3 wherein each of said coils includes a first former underlying said plate and having upwardly extending arms traversing same, a second former overlying said plate and having arms meeting the arms of said first former, said second former having a core, and a winding surrounding said core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |