Patent US2991535A successfully refreshed from Google Patents.
US2991535A
Expired / Lapsed
US
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Tunnel kiln firing section
Assignee: Individual
•
Filing: 1957-07-09
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Granted: 1961-07-11
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Expires: 1977-07-09
Abstract
No abstract record available.
Inventors
- 👤 William L Hanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:27
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/30; F27B9/3005; F27B9/3011; F27B9/36; F27B2009/305; F27B2009/3061; F27B9/14; F27B9/20; F27B9/26; F27B9/262; F27M; F27M2001/00; F27M2001/15; F27M2001/1504; F27M2001/1508
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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |