Patent US2884072A successfully refreshed from Google Patents.
US2884072A
Expired / Lapsed
US
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Safety valve for well pipes
Assignee: Individual
•
Filing: 1956-07-09
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Granted: 1959-04-28
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Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:19
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1303091A
Cited
US925906A
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US2317021A
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US2355199A
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US2507262A
Cited
US2681705A
Cited
US2663545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |