Patent US3324950A successfully refreshed from Google Patents.
US3324950A
Expired / Lapsed
US
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Pitless well unit
Assignee: DUPLEX Manufacturing CO
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Filing: 1965-06-11
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Granted: 1967-06-13
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Homer L Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:18
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E03; E03B; E03B5/00; E03B5/04; E03B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A PITLESS WELL UNIT FOR USE WITH A WELL CASING AND DROP PIPE INCLUDING: (A) A SURFACE PIPE ARRANGED TO HAVE ONE END THEREOF CONNECTED WITH THE UPPER END OF A WELL CASING; (B) A DISCHARGE SEAT ARRANGED WITHIN THE LOWER END OF SAID SURFACE PIPE AND PROVIDING MEANS FOR ATTACHMENT TO A LATERAL DISCHARGE PIPE FOR DISCHARGE OF FLUID THERETO, PROVIDING A SEALING SEAT WITHIN SAID SURFACE PIPE SAID SEAT BEING ANGULARLY DISPOSED WITH RESPECT TO VERTICAL TO RECEIVE A MEMBER THEREAGAINST AS INSERTED FROM THE UPPER END OF THE SURFACE PIPE; AND (C) A FLUID DISTRIBUTOR HEAD ARRANGED TO ENGAGE AND RECEIVE FLUID FROM THE DROP PIPE TO BE RECEIVED WITHIN SAID SURFACE PIPE AND HAVING A SEALING SURFACE THEREON TO ENGAGE THE SEALING SURFACE OF SAID DISCHARGE SEAT FOR SEALING THEREWITH TO FACILITATE FLOW OF FLUID FROM THE DROP PIPE TO THE LATERAL DISCHARGE PIPE AND HAVING SUPPORT MEANS THEREON FOR SUPPORT OF THE DROP PIPE SUBSTANTIALLY IN AXIAL ALIGNMENT WITH THE WELL CASING.
Claim 2
Dependent Claim
167 words
A PITLESS WELL UNIT FOR USE WITH A WELL CASING AND DROP PIPE INCLUDING: (A) A SURFACE PIPE ARRANGED TO HAVE ONE END THEREOF CONNECTED WITH THE UPPER END OF A WELL CASING; (B) A DISCHARGE SEAT ARRANGED WITHIN THE LOWER END OF SAID SURFACE PIPE AND PROVIDING MEANS FOR ATTACHMENT TO A LATERAL DISCHARGE PIPE FOR DISCHARGE OF FLUID THERETO, PROVIDING A SEALING SEAT WITHIN SAID SURFACE PIPE SAID SEAT BEING ANGULARLY DISPOSED WITH RESPECT TO VERTICAL TO RECEIVE A MEMBER THEREAGAINST AS INSERTED FROM THE UPPER END OF THE SURFACE PIPE; AND (C) A FLUID DISTRIBUTOR HEAD ARRANGED TO ENGAGE AND RECEIVE FLUID FROM THE DROP PIPE TO BE RECEIVED WITHIN SAID SURFACE PIPE AND HAVING A SEALING SURFACE THEREON TO ENGAGE THE SEALING SURFACE OF SAID DISCHARGE SEAT FOR SEALING THEREWITH TO FACILITATE FLOW OF FLUID FROM THE DROP PIPE TO THE LATERAL DISCHARGE PIPE AND HAVING SUPPORT MEANS THEREON FOR SUPPORT OF THE DROP PIPE SUBSTANTIALLY IN AXIAL ALIGNMENT WITH THE WELL CASING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |