Patent US3331591A successfully refreshed from Google Patents.
US3331591A
Expired / Lapsed
US
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Cupola exhaust gas conditioning systems
Assignee: Alco Industries Inc
•
Filing: 1965-10-23
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Granted: 1967-07-18
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Agnese David E Dell
- 👤 Tinker Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:04
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/10; F27B1/18; Y; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S261/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2696275A
Cited
US2484277A
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US2721065A
Cited
US3113168A
Cited
US2964304A
Cited
US3041059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |