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US956371A
Expired / Lapsed
US
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Method of distilling coal.
Assignee: Heinrich Koppers GmbH
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Filing: 1909-05-20
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Granted: 1910-04-26
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Expires: 1929-05-20
Abstract
No abstract record available.
Inventors
- 👤 Heinrich Koppers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:11
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/06
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) | 1913-04-25 | 1913-10-25 | 1914-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1917-04-25 | 1917-10-25 | 1918-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1921-04-25 | 1921-10-25 | 1922-04-26 | $7700.00 | Window Closed / Lapsed |