Patent US3299822A successfully refreshed from Google Patents.
US3299822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pump
Assignee: NOV Process and Flow Technologies UK Ltd
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Filing: 1965-03-31
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Granted: 1967-01-24
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Expires: 1985-03-31
Abstract
No abstract record available.
Inventors
- 👤 Payne Stanley Ashbourne Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:46
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A HELICAL GEAR PUMP COMPRISING INNER AND OUTER RELATIVELY ROTATABLE MEMBERS MESHING SEALINGLY TOGETHER AND DISPOSED ONE WITHIN THE OTHER; A SINGLE INTERNAL HELICAL THREAD FORMED ON SAID OUTER MEMBER TO PROVIDE A TOOTH IN ANY TRANSVERSE SECTION ON SAID OTHER MEMBER; TWO EXTERNAL HELICAL THREADS FORMED ON SAID INNER MEMBER TO PROVIDE TEETH IN ANY TRANSVERSE SECTION ON SAID INNER MEMBER, SAID EXTERNAL THREAD HAVING THE SAME PITCH AS THE INTERNAL HELICAL THREAD OF SAID OUTER MEMBER; A SHAPE TO SAID INTERNAL TOOTH AND A SHAPE TO SAID EXTERNAL TEETH, SAID SHAPES BEING SUCH THAT IN ANY TRANSVERSE SECTION THE TEETH ON THE INNER MEMBER ARE ALWAYS IN CONTACT WITH THE OUTER MEMBER AND THE TOOTH ON THE OUTER MEMBER IS ALWAYS IN CONTACT WITH THE INNER MEMBER.
Claim 2
Dependent Claim
129 words
A HELICAL GEAR PUMP COMPRISING INNER AND OUTER RELATIVELY ROTATABLE MEMBERS MESHING SEALINGLY TOGETHER AND DISPOSED ONE WITHIN THE OTHER; A SINGLE INTERNAL HELICAL THREAD FORMED ON SAID OUTER MEMBER TO PROVIDE A TOOTH IN ANY TRANSVERSE SECTION ON SAID OTHER MEMBER; TWO EXTERNAL HELICAL THREADS FORMED ON SAID INNER MEMBER TO PROVIDE TEETH IN ANY TRANSVERSE SECTION ON SAID INNER MEMBER, SAID EXTERNAL THREAD HAVING THE SAME PITCH AS THE INTERNAL HELICAL THREAD OF SAID OUTER MEMBER; A SHAPE TO SAID INTERNAL TOOTH AND A SHAPE TO SAID EXTERNAL TEETH, SAID SHAPES BEING SUCH THAT IN ANY TRANSVERSE SECTION THE TEETH ON THE INNER MEMBER ARE ALWAYS IN CONTACT WITH THE OUTER MEMBER AND THE TOOTH ON THE OUTER MEMBER IS ALWAYS IN CONTACT WITH THE INNER MEMBER.
References Cited (Backward Citations)
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Cited
US2028407A
Cited
GB425447A
Cited
US2512764A
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US2988065A
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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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |