US3678232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid reservoirs
Assignee: Girling Ltd
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Filing: 1970-12-23
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Granted: 1972-07-18
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Expires: 1990-12-23
Abstract
Abstract A liquid reservoir for use with a tandem master cylinder of a vehicle hydraulic system includes a dividing wall which serves to define a pair of chembers, the diving wall also defines in the chambers respectively guideways which guide the vertical movement of float assemblies. Each float assembly includes a magnet operable to close a pair of contacts in a switch housed in the dividing wall when the liquid level in the respective chamber falls below a predetermined level.
Inventors
- 👤 Peter Kinson Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/02; B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/225; G; G01; G01F; G01F23/00; G01F23/30; G01F23/64; G01F23/72; G01F23/74
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A liquid reservoir for use with a tandem master cylinder of a vehicle hydraulic system, the reservoir defining a pair of isolated chambers, the reservoir comprising in combination a dividing wall serving to isolate the pair of chambers from each other, a pair of float members located in the chambers respectively, a pair of magnets carried by said float members respectively and a single switch means operable by the magnetic field produced by the magnets, each magnet acting to operate said switch when the liquid level in its associated chamber falls to a predetermined level.
Claim 2
Dependent Claim
95 words
A liquid reservoir for use with a tandem master cylinder of a vehicle hydraulic system, the reservoir defining a pair of isolated chambers, the reservoir comprising in combination a dividing wall serving to isolate the pair of chambers from each other, a pair of float members located in the chambers respectively, a pair of magnets carried by said float members respectively and a single switch means operable by the magnetic field produced by the magnets, each magnet acting to operate said switch when the liquid level in its associated chamber falls to a predetermined level.
Claim 3
Dependent Claim
100 words
A liquid reservoir for use with a tandem master cylinder of a vehicle hudraulic system, the reservoir defining a pair of isolated chambers, the reservoir comprising in combination a dividing wall serving to isolate the pair of chambers from each other, a pair of float members located in the chambers respectively, a pair of magnets carried by said float members respectively and a single switch located within said dividing wall and operable by the magnetic field produced by the magnets, each magnet acting to operate said switch when the liquid level in its associated chamber falls to a predetermined level.
Claim 4
Dependent Claim
100 words
A liquid reservoir for use with a tandem master cylinder of a vehicle hudraulic system, the reservoir defining a pair of isolated chambers, the reservoir comprising in combination a dividing wall serving to isolate the pair of chambers from each other, a pair of float members located in the chambers respectively, a pair of magnets carried by said float members respectively and a single switch located within said dividing wall and operable by the magnetic field produced by the magnets, each magnet acting to operate said switch when the liquid level in its associated chamber falls to a predetermined level.
Claim 5
Dependent Claim
18 words
A liquid reservoir as claimed in claim 2 including guideways for guiding the movement of said float members.
Claim 6
Dependent Claim
32 words
A liquid reservoir as claimed in claim 3 in which each guideway comprises a pair of spaced flanges having inturned lips, said flanges and lips being formed integrally with said dividing wall.
Claim 7
Dependent Claim
18 words
A liquid reservoir as claimed in claim 4 in which said switch means comprises an electrical reed switch.
Claim 8
Dependent Claim
29 words
A liquid reservoir as claimed in claim 5 in which said magnets are polarized in a direction substantially at right angles to the direction of movement of the floats.
Claim 9
Dependent Claim
36 words
A liquid reservoir as claimed in claim 6 in which the reservoir is provided with a top, the top including a baffle which co-operates with the dividing wall and limits the upward movement of the floats.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |