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US2601110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulping lignocellulose with sodium aluminate
Assignee: Ontario Paper Co Ltd
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Filing: 1945-06-14
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Granted: 1952-06-17
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Expires: 1965-06-14
Abstract
No abstract record available.
Inventors
- 👤 Fisher John Henry
- 👤 Mead Bruce Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:59
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN THE MANUFACTURE OF PULP FROM FIBROUS LIGNO-CELLULOSE MATERIALS, THE STEP WHICH COMPRISES DIGESTING UNDER AUTOGENOUS PRESSURE THE SAID LIGNO-CELLULOSE MATERIALS WITH AN AQUEOUS SOLUTION CONTAINING SODIUM ALUMINATE AS THE ACTIVE PULPING AGENT, THE SAID ALUMINATE BEING INITIALLY PRESENT IN THE COOKING LIQUOR IN A CONCENTRATION NOT LESS THAN TWO PERCENT NOR MORE THAN FIFTEEN PERCENT, AT TEMPERATURES IN THE RANGE 185* TO 200* C. AND A TIME OF NOT MORE THAN 3 HOURS NOR LESS THAN 2 1/2 HOURS.
Claim 2
Dependent Claim
80 words
IN THE MANUFACTURE OF PULP FROM FIBROUS LIGNO-CELLULOSE MATERIALS, THE STEP WHICH COMPRISES DIGESTING UNDER AUTOGENOUS PRESSURE THE SAID LIGNO-CELLULOSE MATERIALS WITH AN AQUEOUS SOLUTION CONTAINING SODIUM ALUMINATE AS THE ACTIVE PULPING AGENT, THE SAID ALUMINATE BEING INITIALLY PRESENT IN THE COOKING LIQUOR IN A CONCENTRATION NOT LESS THAN TWO PERCENT NOR MORE THAN FIFTEEN PERCENT, AT TEMPERATURES IN THE RANGE 185* TO 200* C. AND A TIME OF NOT MORE THAN 3 HOURS NOR LESS THAN 2 1/2 HOURS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |