Patent US2850301A successfully refreshed from Google Patents.
US2850301A
Expired / Lapsed
US
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Pipe hanger and seal assembly with means to limit pressure applied to the slips
Assignee: Cooper Industries LLC
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Filing: 1955-01-18
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Granted: 1958-09-02
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Expires: 1975-01-18
Abstract
No abstract record available.
Inventors
- 👤 Allen Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:43
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/0422
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1830893A
Cited
US1650102A
Cited
US1943799A
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US2066270A
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US2252240A
Cited
US2481732A
Cited
US2676936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |