US2604305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill tip
Assignee: PEARL EDITH LIVINGSTONE
•
Filing: 1946-10-24
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Granted: 1952-07-22
•
Expires: 1966-10-24
Abstract
No abstract record available.
Inventors
- 👤 Livingstone James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:58
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; E21B10/633; E21B10/36; E21B10/38
Claims Analysis
Total Claims: 0
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US2101376A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |