Patent US3244111A successfully refreshed from Google Patents.
US3244111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual pump
Assignee: TA ACQUISITION CORP
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Filing: 1965-09-14
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Granted: 1966-04-05
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Expires: 1985-09-14
Abstract
No abstract record available.
Inventors
- 👤 Robert E Shelhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:12
CPC Classifications
F; F04; F04C; F04C11/00; F04C11/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A DUAL PUMP ASSEMBLY COMPRISING A HOUSING HAVING A SINGLE CYLINDRICAL PUMP CAVITY THEREIN, A SINGLE DRIVE SHAFT EXTENDING ECCENTRICALLY INTO SAID PUMP CAVITY, A PAIR OF INNER PUMP ROTORS SECURED TO ROTATE IN THE PUMP CAVITY WITH THE SHAFT, SAID PAIR OF INNER PUMP ROTORS BEING POSITIONED ON SAID SHAFT IN AXIALLY SPACED RELATIONSHIP, A PAIR OF OUTER PUMP ROTORS POSITIONED IN SAID CAVITY IN AXIALLY SPACED SIDE BY SAID RELATIONSHIP AND RADIALLY OPPOSITE TO SAID PAIR OF INNER PUMP ROTORS, COOPERATING TEETH ON SAID INNER AND OUTER ROTORS TO PROVIDE A DRIVE CONNECTION THEREBETWEEN AND TO PROVIDE A PAIR OF VARIABLE VOLUME PUMP CHAMBERS, AND FREELY ROTATABLE ANNULAR SEALING MEANS JOURNALED ON SAID SHAFT, SAID SEALING MEANS EXTENDING BETWEEN THE PAIR OF INNER AND OUTER PUMP ROTORS AND DIVIDING SAID CYLINDRICAL PUMP CAVITY INTO SEPARATE PUMP CHAMBERS AND SEPARATE PRESSURE FLUID SUPPLY AND EXHAUST PASSAGES FOR EACH OF SAID PAIR OF VARIABLE VOLUME PUMP CHAMBERS.
Claim 2
Dependent Claim
157 words
A DUAL PUMP ASSEMBLY COMPRISING A HOUSING HAVING A SINGLE CYLINDRICAL PUMP CAVITY THEREIN, A SINGLE DRIVE SHAFT EXTENDING ECCENTRICALLY INTO SAID PUMP CAVITY, A PAIR OF INNER PUMP ROTORS SECURED TO ROTATE IN THE PUMP CAVITY WITH THE SHAFT, SAID PAIR OF INNER PUMP ROTORS BEING POSITIONED ON SAID SHAFT IN AXIALLY SPACED RELATIONSHIP, A PAIR OF OUTER PUMP ROTORS POSITIONED IN SAID CAVITY IN AXIALLY SPACED SIDE BY SAID RELATIONSHIP AND RADIALLY OPPOSITE TO SAID PAIR OF INNER PUMP ROTORS, COOPERATING TEETH ON SAID INNER AND OUTER ROTORS TO PROVIDE A DRIVE CONNECTION THEREBETWEEN AND TO PROVIDE A PAIR OF VARIABLE VOLUME PUMP CHAMBERS, AND FREELY ROTATABLE ANNULAR SEALING MEANS JOURNALED ON SAID SHAFT, SAID SEALING MEANS EXTENDING BETWEEN THE PAIR OF INNER AND OUTER PUMP ROTORS AND DIVIDING SAID CYLINDRICAL PUMP CAVITY INTO SEPARATE PUMP CHAMBERS AND SEPARATE PRESSURE FLUID SUPPLY AND EXHAUST PASSAGES FOR EACH OF SAID PAIR OF VARIABLE VOLUME PUMP CHAMBERS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |