Patent US2604903A successfully refreshed from Google Patents.
US2604903A
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Ram packing element for blowout preventers
Assignee: National Supply Co
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Filing: 1946-09-23
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Granted: 1952-07-29
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Expires: 1966-09-23
Abstract
No abstract record available.
Inventors
- 👤 Claude R Neilon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:19
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US207365A
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US1967417A
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US1836374A
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US1963683A
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US1835891A
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US1966809A
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US1899922A
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US2193110A
Cited
US2194256A
Cited
US2194257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |