US2602636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for marine well drilling
Assignee: Richfield Oil Corp
•
Filing: 1947-06-27
•
Granted: 1952-07-08
•
Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 Jr William J Travers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:05
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027; E21; E21B; E21B15/00; E21B15/02; E02B2017/0039; E02B2017/0047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US89794A
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US1790913A
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GB160865A
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US1517556A
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US1879929A
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US1904256A
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US2187871A
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US2171672A
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US2240794A
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US2422168A
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US2472869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |