US2211957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of furnace charging
Assignee: Individual
•
Filing: 1939-08-01
•
Granted: 1940-08-20
•
Expires: 1959-08-01
Abstract
No abstract record available.
Inventors
- 👤 Hugh R Macmichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:20
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/0025; C; C22; C22B; C22B13/00; C22B13/02; F27D2003/0001; F27D2003/0006; F27D2003/0008; F27D2003/0034; F27D2003/0059; F27D2003/0063; F27D3/12; F27D2003/125; F27D21/00; F27D21/0035; F27D3/04; F27D3/10; F27M; F27M2001/00; F27M2001/01
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) | 1943-08-20 | 1944-02-19 | 1944-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-20 | 1948-02-19 | 1948-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-20 | 1952-02-19 | 1952-08-20 | $7700.00 | Window Closed / Lapsed |