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Patent US3378897A successfully refreshed from Google Patents.
US3378897A
Expired / Lapsed
US
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Tunnel kiln preheating section
Assignee: Individual
•
Filing: 1965-08-04
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Granted: 1968-04-23
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Expires: 1985-08-04
Abstract
No abstract record available.
Inventors
- 👤 William L Hanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:54
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/30; F27B9/3005
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |