US1357780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupola treatment of metals
Assignee: KOPPERS DEVELCPMENT Corp
•
Filing: 1920-09-03
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Granted: 1920-11-02
•
Expires: 1940-09-03
Abstract
No abstract record available.
Inventors
- 👤 Koppers Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:09
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/02; F27B1/025; C; C21; C21C; C21C1/00; C21C1/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S266/00; Y10S266/90
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) | 1923-11-02 | 1924-05-03 | 1924-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-11-02 | 1928-05-03 | 1928-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-11-02 | 1932-05-03 | 1932-11-02 | $7700.00 | Window Closed / Lapsed |