US2856872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized coal firing system
Assignee: Kohlenscheidungs GmbH
•
Filing: 1954-03-31
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Granted: 1958-10-21
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Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 Steinert Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:00
CPC Classifications
F; F23; F23K; F23K3/00; F23K2203/00; F23K2203/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1608699A
Cited
US1627766A
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GB312707A
Cited
US1942687A
Cited
DE891314C
Cited
FR837942A
Cited
US2226923A
Cited
US2259967A
Cited
US2380169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |