US2448199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for blast furnace air
Assignee: Brown Instruments Co
•
Filing: 1944-07-11
•
Granted: 1948-08-31
•
Expires: 1964-07-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Vollrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:34
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/10; C21B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1667355A
Cited
US1458288A
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US1630977A
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US1662851A
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US1872783A
Cited
US2357193A
Cited
US2354400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |