US3013931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing paper and process of making the same
Assignee: Fort James Corp
•
Filing: 1957-02-01
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Granted: 1961-12-19
•
Expires: 1977-02-01
Abstract
No abstract record available.
Inventors
- 👤 James D Wethern
- 👤 Henry A Captein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
THE PROCESS OF MAKING PAPERMAKING PULP WHICH COMPRISES FORMING A MIXTURE OF AT LEAST ONE NON-WOODY LIGNOCELLULOSE SELECTED FROM THE GROUP CONSISTING OF BAGASSE, STRAWS AND GRASSES, TOGETHER WITH AN AQUEOUS LIQUOR CONTAINING FROM 0.1 TO 25% BY WEIGHT OF A WATER-SOLUBLE INORGANIC SULFITE COMPOUND AND HAVING A PH OF 5 TO 11, SAID MIXTURE HAVING A LIQUOR-LIGNOCELLULOSE RATIO, DRY LIGNOCELLULOSE BASIS, OF FROM 2:1 TO 100:1, SOFTENING THE LIGNOCELLULOSE BY MAINTAINING THE MIXTURE AT A TEMPERATURE
References Cited (Backward Citations)
US1859848A
Cited
US1782751A
Cited
US2425024A
Cited
US2598580A
Cited
GB736300A
Cited
US2805156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |