US1631950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means of working blast heaters used in connection with blast furnaces
Assignee: Zimmermann and Jansen GmbH
•
Filing: 1925-04-06
•
Granted: 1927-06-07
•
Expires: 1945-04-06
Abstract
No abstract record available.
Inventors
- 👤 Rappold Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:47
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/10; C21B9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928
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) | 1930-06-06 | 1930-12-06 | 1931-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-06-06 | 1934-12-06 | 1935-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-06-06 | 1938-12-06 | 1939-06-07 | $7700.00 | Window Closed / Lapsed |