US2175291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lining smelting furnaces
Assignee: Individual
•
Filing: 1938-01-03
•
Granted: 1939-10-10
•
Expires: 1958-01-03
Abstract
No abstract record available.
Inventors
- 👤 Heskett John Ambrose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:10
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1678; F27D1/1684; F27D7/00; F27D7/02
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) | 1942-10-09 | 1943-04-10 | 1943-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-09 | 1947-04-10 | 1947-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-09 | 1951-04-10 | 1951-10-10 | $7700.00 | Window Closed / Lapsed |