Patent US5307456A successfully refreshed from Google Patents.
Patent US1572386A successfully refreshed from Google Patents.
US1572386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill bit
Assignee: Individual
•
Filing: 1923-07-16
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Granted: 1926-02-09
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Expires: 1943-07-16
Abstract
No abstract record available.
Inventors
- 👤 Leroy G Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/041; E; E21; E21B; E21B10/00; E21B10/02; E21B10/44; E21B10/60; E21B10/605
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1929-02-08 | 1929-08-10 | 1930-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-02-08 | 1933-08-10 | 1934-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-02-08 | 1937-08-10 | 1938-02-09 | $7700.00 | Window Closed / Lapsed |