US2664273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth cutting tool
Assignee: Individual
•
Filing: 1950-04-28
•
Granted: 1953-12-29
•
Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Merrick Charles Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:52
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B7/003; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US602339A
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US163636A
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US1993365A
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US1847985A
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US2074003A
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US2193219A
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US2239531A
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US2234451A
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US2274107A
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US2281614A
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US2354245A
Cited
US2498192A
Cited
US2529246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |