US1445973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygenated blast for metallurgical furnaces
Assignee: Airco Inc
•
Filing: 1919-02-04
•
Granted: 1923-02-20
•
Expires: 1939-02-04
Abstract
No abstract record available.
Inventors
- 👤 Montague H Roberts
- 👤 Claude C Van Nuys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:31
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/16; F; F27; F27B; F27B17/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-02-19 | 1926-08-21 | 1927-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-02-19 | 1930-08-21 | 1931-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-02-19 | 1934-08-21 | 1935-02-20 | $7700.00 | Window Closed / Lapsed |