US3738908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prehydrolysis and digestion of bagasse fibers
Assignee: Process Evaluation and Development Corp
•
Filing: 1971-06-01
•
Granted: 1973-06-12
•
Expires: 1991-06-01
Abstract
Abstract PULP, SUITABLE FOR PRODUCTION OF NEWSPRINT, IS PREPARED FROM SUGARCANE BAGASSE BY CONTROLLED PREHYDROLYSIS UNDER ACID CONDITIONS FOLLOWED BY DIGESTIONN UNDER ALKALINE CONNDITIONS IN THE PRESENCE OF AN ALKALI METAL SILICATE OR ALKALI METAL BISULFFITE OR MIXTURES THEREOF, AND THEREAFTER ADDING TO THE PULP, PRIOR TO BLOWNDOWN, SUFFICIENT AMOUNTS OF ALKALI METAL SILICATE AS REQUIRED.
Inventors
- 👤 E Villavicencio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:03
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24; D21C3/02; D21C3/022; D21C3/222
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |