Patent US3133595A successfully refreshed from Google Patents.
US3133595A
Expired / Lapsed
US
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Presanded wellpoints
Assignee: Griffin Dewatering Corp
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Filing: 1961-04-20
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Granted: 1964-05-19
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Expires: 1981-04-20
Abstract
No abstract record available.
Inventors
- 👤 Richard W Loughney
- 👤 John F Hoffman
- 👤 Anthony R Bastone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:37
CPC Classifications
E; E03; E03B; E03B3/00; E03B3/06; E03B3/08; E03B3/16; E03B3/18; E03B3/24; E03B3/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
174 words
A WELLPOINT, COMPRISING INNER AND OUTER CONCENTRIC PERFORATED PIPES, SPACED APART BY A NARROW SPACE, INNER AND OUTER CONCENTRIC TUBULAR SCREENS SURROUNDING SAID PIPES, SPACED APART BY A WIDE SPACE, THE INNER OF SAID SCREENS BEING IN CONTACT WITH THE OUTER OF SAID PIPES, A FILLING OF GRANULAR FILTERING MATERIAL IN SAID WIDE SPACE, SAID INNER PIPE BEING LONGER THAN AND HAVING ITS UPPER ANDD LOWER ENDS EXTENDING BEYOND THOSE OF SAID OUTER PIPE, LOWER CAPS THREADED UPON THE LOWER ENDS OF SAID INNER AND OUTER PIPES FOR CLOSING THE LOWER ENDS THEREOF, AN UPPER CAP THREADED UPON THE UPPER END OF SAID OUTER PIPE FOR CLOSING THE UPPER END OF SAID NARROW SPACE, AN ANNULAR WASHER LOCATED BETWEEN SAID LOWER CAPS FOR CLOSING THE LOWER END OF SAID WIDE SPACE, AN UPPER COLLAR THREADED UPON THE UPPER END OF SAID INNER PIPE ADAPTED FOR CONNECTION WITH A RISER PIPE EXTENDING TO THE SURFACE OF THE GROUND, AND A TUBULAR HOOD FITTING OVER THE UPPER END OF SAID OUTER SCREEN, CONVERGING UPWARDLY, ADAPTED FOR
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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |