Patent US1637594A successfully refreshed from Google Patents.
US1637594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary bit for drilling wells
Assignee: Individual
•
Filing: 1926-03-15
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Granted: 1927-08-02
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Expires: 1946-03-15
Abstract
No abstract record available.
Inventors
- 👤 Stewart Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:29
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/003; E21B10/08; E21B10/10; E21B10/12; E21B10/14; E21B10/26; E21B10/28; E21B10/30
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) | 1930-08-01 | 1931-01-31 | 1931-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-01 | 1935-01-31 | 1935-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-01 | 1939-01-31 | 1939-08-02 | $7700.00 | Window Closed / Lapsed |