US2658636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling pressure between bells of blast furnaces
Assignee: Arthur D Little Inc
•
Filing: 1949-06-14
•
Granted: 1953-11-10
•
Expires: 1969-06-14
Abstract
No abstract record available.
Inventors
- 👤 Dawbarn Waring Lennox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:07
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1727100A
Cited
US2131031A
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GB502942A
Cited
US2192885A
Cited
US2200488A
Cited
US2411487A
Cited
US2516190A
Cited
US2408945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |