Patent US3463469A successfully refreshed from Google Patents.
US3463469A
Expired / Lapsed
US
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Kilns with atmosphere propulsion
Assignee: Individual
•
Filing: 1967-11-16
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Granted: 1969-08-26
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Expires: 1987-11-16
Abstract
No abstract record available.
Inventors
- 👤 Donald P Shelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:42
CPC Classifications
F; F27; F27B; F27B17/00; F27B17/0016; F27B17/0083; F27D; F27D7/00; F27D7/04
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) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |