Patent US3495309A successfully refreshed from Google Patents.
US3495309A
Expired / Lapsed
US
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Continuous kiln with varying temperature zones
Assignee: PHILIP E KOPP
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Filing: 1967-06-01
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Granted: 1970-02-17
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Expires: 1987-06-01
Abstract
No abstract record available.
Inventors
- 👤 Philip E Kopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:18
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/30; F27B9/3005; F27B9/3011; F27B9/24; F27B9/2407; F27M; F27M2001/00; F27M2001/15; F27M2001/1504
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) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |