Patent US3139835A successfully refreshed from Google Patents.
US3139835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump or motor
Assignee: Davey Compressor Co
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Filing: 1962-08-15
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Granted: 1964-07-07
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Expires: 1982-08-15
Abstract
No abstract record available.
Inventors
- 👤 William H Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:18
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/06; F04C15/0057; F04C15/0061; F04C2/00; F04C2/08; F04C2/10; F04C2/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
IN A ROTARY PUMP OR MOTOR, THE COMBINATION OF: (A) A ROTARY GEAR ELEMENT; (B) AN INTERNAL RING GEAR ELEMENT MESHING THEREWITH TO FORM VARYING SIZED CHAMBERS BETWEEN THE OUTER PERIPHERY OF SAID ROTARY GEAR ELEMENT AND THE INNER SURFACE OF SAID INTERNAL RING GEAR ELEMENT; (C) A PORTING CONSTRUCTION COMPRISING A COMMUNICATION MEANS BETWEEN SUCCESSIVE TEETH OF SAID INTERNAL RING GEAR ELEMENT, SAID COMMUNICATION MEANS COMMUNICATING BETWEEN THE INNER SURFACE AND THE PERIPHERY OF SAID INTERNAL RING GEAR ELEMENT, AN ANNULAR RING CONTACTING THE PERIPHERY OF SAID INTERNAL RING GEAR ELEMENT, A PLURALITY OF DISCHARGE PORTS AND A PLURALITY OF INTAKE PORTS, SAID DISCHARGE PORTS BEING ALTERNATELY ARRANGED WITH SAID INTAKE PORTS IN SAID ANNULAR RING, AND MEANS ON SAID ANNULAR RING FOR POSITIONING A DISCHARGE PORT IN COMMUNICATION WITH EACH SAID COMMUNICATION MEANS ON DECREASE IN SIZE OF SAID VARYING SIZED CHAMBERS AND FOR POSITIONING AN INTAKE PORT IN COMMUNICATION WITH EACH SAID COMMUNICATION MEANS ON INCREASE IN SIZE OF SAID VARYING SIZED CHAMBERS.
Claim 2
Dependent Claim
166 words
IN A ROTARY PUMP OR MOTOR, THE COMBINATION OF: (A) A ROTARY GEAR ELEMENT; (B) AN INTERNAL RING GEAR ELEMENT MESHING THEREWITH TO FORM VARYING SIZED CHAMBERS BETWEEN THE OUTER PERIPHERY OF SAID ROTARY GEAR ELEMENT AND THE INNER SURFACE OF SAID INTERNAL RING GEAR ELEMENT; (C) A PORTING CONSTRUCTION COMPRISING A COMMUNICATION MEANS BETWEEN SUCCESSIVE TEETH OF SAID INTERNAL RING GEAR ELEMENT, SAID COMMUNICATION MEANS COMMUNICATING BETWEEN THE INNER SURFACE AND THE PERIPHERY OF SAID INTERNAL RING GEAR ELEMENT, AN ANNULAR RING CONTACTING THE PERIPHERY OF SAID INTERNAL RING GEAR ELEMENT, A PLURALITY OF DISCHARGE PORTS AND A PLURALITY OF INTAKE PORTS, SAID DISCHARGE PORTS BEING ALTERNATELY ARRANGED WITH SAID INTAKE PORTS IN SAID ANNULAR RING, AND MEANS ON SAID ANNULAR RING FOR POSITIONING A DISCHARGE PORT IN COMMUNICATION WITH EACH SAID COMMUNICATION MEANS ON DECREASE IN SIZE OF SAID VARYING SIZED CHAMBERS AND FOR POSITIONING AN INTAKE PORT IN COMMUNICATION WITH EACH SAID COMMUNICATION MEANS ON INCREASE IN SIZE OF SAID VARYING SIZED 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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |