US2901990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic roof for reverberatory furnaces
Assignee: General Refractories Co
•
Filing: 1954-10-28
•
Granted: 1959-09-01
•
Expires: 1974-10-28
Abstract
No abstract record available.
Inventors
- 👤 Hutter Luis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1859517A
Cited
US1845968A
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FR807010A
Cited
US2230142A
Cited
US2652793A
Cited
US2606017A
Cited
US2670698A
Cited
US2683032A
Cited
US2737912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |