Patent US3970413A successfully refreshed from Google Patents.
US3970413A
Expired / Lapsed
US
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Fluid distribution apparatus and method
Assignee: Individual
•
Filing: 1973-12-10
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Granted: 1976-07-20
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Expires: 1993-12-10
Abstract
Abstract Systems for delivering fluid at substantially constant pressure to consuming loads which exhibit widely varying demands. The systems employ parallel connected booster pumps which may be operated in either of two rotational directions to provide two output flow rates for each pump.
Inventors
- 👤 Francois Duveau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2066; G05D16/2073; F; F04; F04B; F04B49/00; F04B49/007; F04B49/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
In a fluid distribution system including a fluid source and a fluid distribution circuit the improvement comprising: booster pump means, said pump means including at least a first motor-pump group, said motor-pump group comprising a centrifugal pump controlled by a reversible motor and connected between the source and distribution circuit; and means for selectively controlling said motor for rotation in a first direction to provide a first flow rate and in the second direction to provide a second flow rate in response to a predetermined variation of flow in the distribution circuit.
Claim 2
Dependent Claim
92 words
In a fluid distribution system including a fluid source and a fluid distribution circuit the improvement comprising: booster pump means, said pump means including at least a first motor-pump group, said motor-pump group comprising a centrifugal pump controlled by a reversible motor and connected between the source and distribution circuit; and means for selectively controlling said motor for rotation in a first direction to provide a first flow rate and in the second direction to provide a second flow rate in response to a predetermined variation of flow in the distribution circuit.
Claim 3
Dependent Claim
93 words
The apparatus of claim 1 further comprising: at least a second motor-pump group, said second motor-pump group comprising a second centrifugal pump controlled by a second reversible motor; and means connecting said second pump in parallel with said first pump, said second motor being controlled by said controlling means to rotate in a first direction to cause said second pump to provide a first flow rate and in a second direction to cause said second pump to provide a second flow rate in response to predetermined variations of flow in the distribution circuit.
Claim 4
Dependent Claim
29 words
The apparatus of claim 2 wherein said first and second pumps have the same operating characteristics and said controlling means includes means for operating said motors separately or simultaneously.
Claim 5
Dependent Claim
44 words
The apparatus of claim 3 wherein said controlling means comprises: pressure responsive transducer means for sensing the output pressure of each pump; and relay means responsive to said transducer means for individually controlling the energization and direction of rotation of each of said motors.
Claim 6
Dependent Claim
70 words
The apparatus of claim 4 wherein said relay means comprises: switch means for energizing said first motor for rotation in said first direction; and means responsive to the sensing of a first pressure level for energizing said second motor for rotation in a first direction commensurate with the lower of the two output flow rates of said second pump, said second pump thereby rotating in parallel with said first pump.
Claim 7
Dependent Claim
40 words
The apparatus of claim 5 further comprising: means responsive to the sensing of a second pressure level less than said first level for deenergizing said first and second motors and reenergizing said first motor for rotation in said second direction.
Claim 8
Dependent Claim
23 words
The apparatus of claim 6 wherein said means responsive to the sensing of said second pressure level comprises: second time delay relay means.
Claim 9
Dependent Claim
23 words
The apparatus of claim 7 wherein said means responsive to the sensing of said first pressure level comprises: first time delay relay means.
References Cited (Backward Citations)
US3060858A
Cited
US2960828A
Cited
US3195555A
Cited
US3301188A
Cited
US3374744A
Cited
US3726607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |