Patent US7569062B1 successfully refreshed from Google Patents.
US3472518A
Expired / Lapsed
US
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Dynamic seal for drill pipe annulus
Assignee: Texaco Inc
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Filing: 1966-10-24
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Granted: 1969-10-14
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 Don L Harlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:29
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; Y; Y10; Y10S; Y10S277/00; Y10S277/927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2721747A
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US2786652A
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US2883214A
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US3052300A
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US3023012A
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US3246901A
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US3268233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |