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Patent US1131852A successfully refreshed from Google Patents.
US1131852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic system of mining coal and removing foul gases from mine-chambers.
Assignee: AMERICAN MORGAN Co
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Filing: 1914-07-06
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Granted: 1915-03-16
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Expires: 1934-07-06
Abstract
No abstract record available.
Inventors
- 👤 Edmund C Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:20
CPC Classifications
E; E21; E21F; E21F1/00; E21F1/14
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) | 1918-03-15 | 1918-09-14 | 1919-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1922-03-15 | 1922-09-14 | 1923-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1926-03-15 | 1926-09-14 | 1927-03-16 | $7700.00 | Window Closed / Lapsed |