US2727737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupola furnace with lining and blocks therefor
Assignee: Individual
•
Filing: 1952-08-23
•
Granted: 1955-12-20
•
Expires: 1972-08-23
Abstract
No abstract record available.
Inventors
- 👤 William E Dole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:37
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/12; F27B; F27B1/00; F27B1/10; F27B1/12; F27B1/14; F27D1/04; F27D1/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE125333C
Cited
US721417A
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US991805A
Cited
US1058674A
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US1279446A
Cited
GB257261A
Cited
US1696812A
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US2230142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |