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US1293902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mining sulfur.
Assignee: Individual
•
Filing: 1918-09-25
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Granted: 1919-02-11
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Expires: 1938-09-25
Abstract
No abstract record available.
Inventors
- 👤 John W Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/285
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) | 1922-02-10 | 1922-08-12 | 1923-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-02-10 | 1926-08-12 | 1927-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-02-10 | 1930-08-12 | 1931-02-11 | $7700.00 | Window Closed / Lapsed |