US1452627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of sponge iron and other metallic products
Assignee: Individual
•
Filing: 1921-01-21
•
Granted: 1923-04-24
•
Expires: 1941-01-21
Abstract
No abstract record available.
Inventors
- 👤 Edwin B Thornhill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:23
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/10; C21B13/105; F; F23; F23D; F23D14/00; F23D14/02; F23D14/04; F23D14/10
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) | 1926-04-23 | 1926-10-23 | 1927-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-23 | 1930-10-23 | 1931-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-23 | 1934-10-23 | 1935-04-24 | $7700.00 | Window Closed / Lapsed |