Patent US2628829A successfully refreshed from Google Patents.
US2628829A
Expired / Lapsed
US
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Calcining apparatus
Assignee: Basic Refractories Inc
•
Filing: 1947-10-25
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Granted: 1953-02-17
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Expires: 1967-10-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Ruiz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:59
CPC Classifications
B; B01; B01J; B01J6/00; B01J6/001
Claims Analysis
Total Claims: 0
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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) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |