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US3549483A
Expired / Lapsed
US
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Impregnation and digestion of cellulosic material in a single vessel
Assignee: Lummus Technology LLC
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Filing: 1967-08-04
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Granted: 1970-12-22
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Expires: 1987-08-04
Abstract
No abstract record available.
Inventors
- 👤 Albert Edward Harold Fair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:08
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3258390A
Cited
US3215588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |