US2582054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulping process
Assignee: Cellulose du Pin SA
•
Filing: 1946-09-12
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Granted: 1952-01-08
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Expires: 1966-09-12
Abstract
No abstract record available.
Inventors
- 👤 Michon Jacques Bernard Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:52
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD OF MAKING CELLULOSIC PULP THAT COMPRISES IMPREGNATING NATURAL LIGNO-CELLULOSIC MATERIAL WITH HOT ALKALINE DIGESTING LIQUOR, IM MERSING THE MATERIAL QUICKLY IN LARGE QUANTITY OF PREHEATED ALKALINE DIGESTING LIQUOR UNDER PRESSURE AT A TEMPERATURE CIRCA 170-180* C., DIGESTING THE MATERIAL IN SAID LIQUOR, DRAINING OFF THE LUQUID FROM THE DIGESTED MASS, AND COOKING THE MASS BY ITS ABSORBED LIQUOR.
Claim 2
Independent Claim
60 words
THE METHOD OF MAKING CELLULOSIC PULP THAT COMPRISES IMPREGNATING NATURAL LIGNO-CELLULOSIC MATERIAL WITH HOT ALKALINE DIGESTING LIQUOR, IM MERSING THE MATERIAL QUICKLY IN LARGE QUANTITY OF PREHEATED ALKALINE DIGESTING LIQUOR UNDER PRESSURE AT A TEMPERATURE CIRCA 170-180* C., DIGESTING THE MATERIAL IN SAID LIQUOR, DRAINING OFF THE LUQUID FROM THE DIGESTED MASS, AND COOKING THE MASS BY ITS ABSORBED LIQUOR.
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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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |