Patent US1480733A successfully refreshed from Google Patents.
US1480733A
Expired / Lapsed
US
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System and apparatus for mining coal
Assignee: Individual
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Filing: 1920-04-28
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Granted: 1924-01-15
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Expires: 1940-04-28
Abstract
No abstract record available.
Inventors
- 👤 Morgan Olive Eugenie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:46
CPC Classifications
E; E21; E21F; E21F13/00; E21F13/06; E21D; E21D17/00; E21D17/02; E21D17/0206; E21D19/00; E21D23/00; E21D23/0052
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) | 1927-01-14 | 1927-07-16 | 1928-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-01-14 | 1931-07-16 | 1932-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-01-14 | 1935-07-16 | 1936-01-15 | $7700.00 | Window Closed / Lapsed |