Patent US5041869A successfully refreshed from Google Patents.
Patent US3976121A successfully refreshed from Google Patents.
US3976121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection apparatus
Assignee: Denso Marston Ltd
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Filing: 1974-11-18
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Granted: 1976-08-24
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Expires: 1994-11-18
Abstract
Abstract A conductivity probe unit comprising a chamber with a restricted entrance and an internal button electrode, the chamber being located in the header tank of a radiator.
Inventors
- 👤 Martin Stanley Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:03
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241; G01F23/242; F; F28; F28F; F28F2265/00; F28F2265/16; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A system for detecting liquid level changes in a motor vehicle cooling circuit containing an aqueous solution susceptible to formation of electrically-conducting froth, said system including a radiator having a core and a header tank, the header tank incorporating an electrical conductivity probe unit comprising a chamber containing an electrical probe electrically insulated from the body of the header tank and connected to an electrical detection circuit, the chamber being in restricted liquid communication with the interior of the header tank through a froth barrier in the form of a foraminate obturating member so that said detection circuit is unaffected by froth which may be present in said header tank.
Claim 2
Independent Claim
110 words
A system for detecting liquid level changes in a motor vehicle cooling circuit containing an aqueous solution susceptible to formation of electrically-conducting froth, said system including a radiator having a core and a header tank, the header tank incorporating an electrical conductivity probe unit comprising a chamber containing an electrical probe electrically insulated from the body of the header tank and connected to an electrical detection circuit, the chamber being in restricted liquid communication with the interior of the header tank through a froth barrier in the form of a foraminate obturating member so that said detection circuit is unaffected by froth which may be present in said header tank.
Claim 3
Dependent Claim
17 words
A radiator as claimed in claim 1 in which the chamber is integral with the header tank.
Claim 4
Dependent Claim
16 words
A radiator as claimed in claim 1 in which the chamber is of electrically insulating material.
Claim 5
Dependent Claim
18 words
A radiator as claimed in claim 3 in which the insulating material is a plastics material, preferably polytetrafluoroethylene.
Claim 6
Dependent Claim
28 words
A radiator as claimed in claim 1 in which the chamber is cup-shaped and is screwed into a threaded bush, the bush being secured to the header tank.
Claim 7
Dependent Claim
21 words
A radiator as claimed in claim 5 in which there is a sealing washer between the bush and the cup-shaped member.
Claim 8
Dependent Claim
24 words
A radiator as claimed in claim 5 in which the cup-shaped member has at least one pair of opposed flats on its exterior surface.
Claim 9
Dependent Claim
34 words
A radiator as claimed in claim 1 in which the conductivity probe is a button electrode sealed into the wall of the chamber and communicating through the wall with the exterior of the chamber.
Claim 10
Dependent Claim
19 words
A radiator as claimed in claim 8 in which the electrode is brass and is rivetted to the chamber.
Claim 11
Dependent Claim
21 words
A radiator as claimed in claim 8 in which there is a resilient seal between the chamber wall and the electrode.
Claim 12
Dependent Claim
16 words
A radiator as claimed in claim 1 in which the obturating member is an apertured disc.
Claim 13
Dependent Claim
32 words
A radiator as claimed in claim 11 in which there are two apertures, located one above the other, the apertures having sizes in the range 1/8 inch diameter to 3/16 inch diameter.
Claim 14
Dependent Claim
12 words
A radiator as claimed in claim 1 which is a cross-flow radiator.
References Cited (Backward Citations)
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Cited
US3230770A
Cited
US3495214A
Cited
US3603926A
Cited
US3805230A
Cited
US3845464A
Cited
US3832982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |