Patent US2851112A successfully refreshed from Google Patents.
US2851112A
Expired / Lapsed
US
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Casing protector
Assignee: Phillips Petroleum Co
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Filing: 1953-10-02
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Granted: 1958-09-09
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Expires: 1973-10-02
Abstract
No abstract record available.
Inventors
- 👤 William B Buck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:49
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1007; E21B43/00; E21B43/02; E21B43/10; E21B43/103; E21B43/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US790208A
Cited
AT27764B
Cited
US1262107A
Cited
US2196652A
Cited
US2107784A
Cited
US2642268A
Cited
US2721058A
Cited
US2693633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |