US2920010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of wood pulp
Assignee: Individual
•
Filing: 1957-10-29
•
Granted: 1960-01-05
•
Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Voiret Eugene Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:26
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/222
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A SEMI-CHEMICAL PROCESS FOR THE MANUFACTURE OF PULP FROM UNSELECTED AND UNTREATED DECIDUOUS WOOD, WHICH CONSISTS IN COOKING THE WOOD MATERIAL WITH A SODIUM SULPHITE SOLUTION CONTAINING A SMALL PERCENTAGE OF SODIUM HYDROSULPHITE AND OF SODIUM OXALATE UNDER SUCH CONDITIONS THAT THE FINAL PH VALUE OF THE SOLUTION IS COMPRISED BETWEEN 5 AND 7, AND IN THEREAFTER MECHANICALLY REDUCING TO PULP THE COOKED MATERIAL.
Claim 2
Dependent Claim
64 words
A SEMI-CHEMICAL PROCESS FOR THE MANUFACTURE OF PULP FROM UNSELECTED AND UNTREATED DECIDUOUS WOOD, WHICH CONSISTS IN COOKING THE WOOD MATERIAL WITH A SODIUM SULPHITE SOLUTION CONTAINING A SMALL PERCENTAGE OF SODIUM HYDROSULPHITE AND OF SODIUM OXALATE UNDER SUCH CONDITIONS THAT THE FINAL PH VALUE OF THE SOLUTION IS COMPRISED BETWEEN 5 AND 7, AND IN THEREAFTER MECHANICALLY REDUCING TO PULP THE COOKED MATERIAL.
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) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |