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Patent US1218404A successfully refreshed from Google Patents.
US1218404A
Expired / Lapsed
US
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Mine-door-operating apparatus.
Assignee: Individual
•
Filing: 1916-06-24
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Granted: 1917-03-06
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Expires: 1936-06-24
Abstract
No abstract record available.
Inventors
- 👤 William Martin Hummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:23
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/611; E05F15/614; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/106; E05Y2900/40
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) | 1920-03-05 | 1920-09-04 | 1921-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-03-05 | 1924-09-04 | 1925-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-03-05 | 1928-09-04 | 1929-03-06 | $7700.00 | Window Closed / Lapsed |