Patent US2429416A successfully refreshed from Google Patents.
US2429416A
Expired / Lapsed
US
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Low-temperature carbonization process and product
Assignee: PITTSBURGH COAL CARBONISATION
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Filing: 1941-08-14
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Granted: 1947-10-21
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Expires: 1961-08-14
Abstract
No abstract record available.
Inventors
- 👤 Carl E Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:17
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/08; C10B57/00; C10B57/04; C10B57/06
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |