US1494224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for blast furnaces
Assignee: Individual
•
Filing: 1921-12-01
•
Granted: 1924-05-13
•
Expires: 1941-12-01
Abstract
No abstract record available.
Inventors
- 👤 Dyrssen Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:00
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/10; C21B9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4621; Y10T137/6416; Y10T137/6579; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86984
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) | 1927-05-13 | 1927-11-12 | 1928-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-05-13 | 1931-11-12 | 1932-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-05-13 | 1935-11-12 | 1936-05-13 | $7700.00 | Window Closed / Lapsed |