US2595962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard rock drill head
Assignee: Individual
•
Filing: 1948-05-06
•
Granted: 1952-05-06
•
Expires: 1968-05-06
Abstract
No abstract record available.
Inventors
- 👤 Letts Orlando Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:53
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17761; Y10T279/17786; Y10T403/00; Y10T403/60; Y10T403/602; Y10T403/604
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US836845A
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US829633A
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US874455A
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GB190803515A
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GB190805778A
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US1718462A
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US2022194A
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US2101865A
Cited
FR799826A
Cited
US2110397A
Cited
US2252745A
Cited
US2454771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |