Patent US3417538A successfully refreshed from Google Patents.
US3417538A
Expired / Lapsed
US
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Kiln liner block supporting structure
Assignee: CALVIN B DEAN
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Filing: 1967-02-17
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Granted: 1968-12-24
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Expires: 1987-02-17
Abstract
No abstract record available.
Inventors
- 👤 Calvin B Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:52
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1621; F23; F23M; F23M5/00; F23M5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |