US2717564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof structure for metallurgical furnaces
Assignee: Individual
•
Filing: 1949-09-08
•
Granted: 1955-09-13
•
Expires: 1969-09-08
Abstract
No abstract record available.
Inventors
- 👤 Kreutzer Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:13
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1095920A
Cited
US1265493A
Cited
US1549583A
Cited
US1904596A
Cited
US2126901A
Cited
FR852963A
Cited
US2429520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |