US2549787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcining kiln
Assignee: Individual
•
Filing: 1947-11-21
•
Granted: 1951-04-24
•
Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 John B Dube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; F27B7/16; F27B7/161; C; C10; C10B; C10B1/00; C10B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1065597A
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US2229383A
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US2387014A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |