US2933219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feeders of pulverized coal
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1958-06-18
•
Granted: 1960-04-19
•
Expires: 1978-06-18
Abstract
No abstract record available.
Inventors
- 👤 Taniyama Toshio
- 👤 Karato Yoshiichi
- 👤 Usamoto Teruyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:22
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/06; F23K2203/00; F23K2203/002; F23K2203/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157935A
Cited
US2468712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |