US2924547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid neutral sulfite process for pulping bagasse and other non-woody plant lignocellulose
Assignee: HAWAIIAN DEV CO Ltd
•
Filing: 1954-11-08
•
Granted: 1960-02-09
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Knapp
- 👤 James D Wethern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04; D21C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN THE NEUTRAL SULFITE PROCESS FOR PULPING FIBROUS, NON-WOODY, LIGNOCELLULOSIC PLANT MATERIALS WITH AN AQUEOUS PULPING LIQUOR CONTAINING A SLUFITE COMPOUND LIGNOCELLULOSE PULPING AGENT TO PRODUCE A PAPERMAKING PULP, THE IMPROVEMENT WHICH COMPRISING LIMITING TO A TIME OF UP TO 60 MINUTES THE RISE TIME PERIOD EMPLOYED FOR HEATING THE MIXTURE OF PLANT MATERIAL AND PULPING LIQUOR TO DIGESTION TEMPERATURE, AND MAINTAINING THE MIXTURE AT SAID DIGESTION TEMPERATURE OVER A DIGESTION TIME PERIOD OF FROM 3 TO 60 MINUTES.
Claim 2
Dependent Claim
79 words
IN THE NEUTRAL SULFITE PROCESS FOR PULPING FIBROUS, NON-WOODY, LIGNOCELLULOSIC PLANT MATERIALS WITH AN AQUEOUS PULPING LIQUOR CONTAINING A SLUFITE COMPOUND LIGNOCELLULOSE PULPING AGENT TO PRODUCE A PAPERMAKING PULP, THE IMPROVEMENT WHICH COMPRISING LIMITING TO A TIME OF UP TO 60 MINUTES THE RISE TIME PERIOD EMPLOYED FOR HEATING THE MIXTURE OF PLANT MATERIAL AND PULPING LIQUOR TO DIGESTION TEMPERATURE, AND MAINTAINING THE MIXTURE AT SAID DIGESTION TEMPERATURE OVER A DIGESTION TIME PERIOD OF FROM 3 TO 60 MINUTES.
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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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |