Patent US3314481A successfully refreshed from Google Patents.
US3314481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Downhole water filter
Assignee: ExxonMobil Upstream Research Co
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Filing: 1964-08-07
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Granted: 1967-04-18
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Expires: 1984-08-07
Abstract
No abstract record available.
Inventors
- 👤 Bertram T Willman
- 👤 Carl T Hester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:48
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/082; E21B43/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A DOWNHOLE FILTER ASSEMBLY COMPRISING A CENTRAL PERFORATED TUBULAR MEMBER, A CHECK VALVE BELOW THE PERFORATED INTERVAL OF SAID TUBULAR MEMBER, A CYLINDRICAL FILTER ELEMENT SURROUNDING THE PERFORATED INTERVAL OF SAID INNER TUBULAR MEMBER, AN OUTER CYLINDRICAL SHIELD SUBSTANTIALLY CONCENTRIC WITH SAID INNER TUBULAR MEMBER, SAID SHIELD BEING SUBSTANTIALLY IMPERFORATE OPPOSITE THE PER-
Claim 2
Dependent Claim
53 words
A DOWNHOLE FILTER ASSEMBLY COMPRISING A CENTRAL PERFORATED TUBULAR MEMBER, A CHECK VALVE BELOW THE PERFORATED INTERVAL OF SAID TUBULAR MEMBER, A CYLINDRICAL FILTER ELEMENT SURROUNDING THE PERFORATED INTERVAL OF SAID INNER TUBULAR MEMBER, AN OUTER CYLINDRICAL SHIELD SUBSTANTIALLY CONCENTRIC WITH SAID INNER TUBULAR MEMBER, SAID SHIELD BEING SUBSTANTIALLY IMPERFORATE OPPOSITE THE PER-
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) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |