US3160398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete mixing apparatus
Assignee: Stothert and Pitt Ltd
•
Filing: 1963-01-24
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Granted: 1964-12-08
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Expires: 1983-01-24
Abstract
No abstract record available.
Inventors
- 👤 Green Rowland Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:43
CPC Classifications
B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4206; B28C5/421; B28C5/4213
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
CONCRETE MIXING APPARATUS COMPRISING IN COMBINA- ON TION, A DRUM MIXER MOUNTED TO REVOLVE ON A TRANSPORTER VEHICLE FOR THE DELIVERY OF READY-MIXED CONCRETE; A PRIME MOVER FOR SAID VEHICLE; MEANS VARIABLY POSITIONABLE ACCORDING TO THE SPEED OF SAID PRIME MOVER; A HYDRAULIC DRIVE FOR SAID DRUM MIXER INCLUDING A VARIABLE DISPLACEMENT PUMP OPERATIVELY COUPLED TO SAID PRIME MOVER AND HAVING A PUMP OUTPUT CONTROL MEMBER WHICH IS SETTABLE TO VARY THE PUMP OUTPUT AT A GIVEN PUMP SPEED, AND A HYDRAULIC MOTOR IN THE OUTPUT CIRCUIT FROM SAID VARIABLE DISPLACEMENT PUMP FOR IMPARTING DRIVE TO SAID MIXING DRUM; AND MEANS OPERABLE AUTOMATICALLY IN RESPONSE TO POSITIONING OF SAID VARIABLY POSITIONABLE MEANS FOR SETTING SAID PUMP OUTPUT CONTROL MEMBER TO MAINTAIN THE PUMP OUTPUT CONSTANT WHEN THE SPEEDS OF SAID PRIME MOVER AND SAID PUMP VARY.
Claim 2
Dependent Claim
136 words
CONCRETE MIXING APPARATUS COMPRISING IN COMBINA- ON TION, A DRUM MIXER MOUNTED TO REVOLVE ON A TRANSPORTER VEHICLE FOR THE DELIVERY OF READY-MIXED CONCRETE; A PRIME MOVER FOR SAID VEHICLE; MEANS VARIABLY POSITIONABLE ACCORDING TO THE SPEED OF SAID PRIME MOVER; A HYDRAULIC DRIVE FOR SAID DRUM MIXER INCLUDING A VARIABLE DISPLACEMENT PUMP OPERATIVELY COUPLED TO SAID PRIME MOVER AND HAVING A PUMP OUTPUT CONTROL MEMBER WHICH IS SETTABLE TO VARY THE PUMP OUTPUT AT A GIVEN PUMP SPEED, AND A HYDRAULIC MOTOR IN THE OUTPUT CIRCUIT FROM SAID VARIABLE DISPLACEMENT PUMP FOR IMPARTING DRIVE TO SAID MIXING DRUM; AND MEANS OPERABLE AUTOMATICALLY IN RESPONSE TO POSITIONING OF SAID VARIABLY POSITIONABLE MEANS FOR SETTING SAID PUMP OUTPUT CONTROL MEMBER TO MAINTAIN THE PUMP OUTPUT CONSTANT WHEN THE SPEEDS OF SAID PRIME MOVER AND SAID PUMP VARY.
References Cited (Backward Citations)
US2968915A
Cited
US3080152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |