Patent US3560331A successfully refreshed from Google Patents.
US3560331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulping of wood with sulfite base digestion liquor containing acetic acid
Assignee: Rayonier Inc
•
Filing: 1968-03-04
•
Granted: 1971-02-02
•
Expires: 1988-03-04
Abstract
Abstract A HIGH-GRADE SULFITE WOOD PULP OF SUBSTANTIALLY INCREASED BLEACHABILITY AND INTRINSIC VISCOSITY IS PRODUCED BY DISGESTING WOOD IN A CONVENTIONAL MANNER WITH A SOLUBLE-BASE SULFITE DIGESTION LIQUOR IN WHICH FROM ABOUT 20 TO 75 PERCENT OF THE WATER, BY VOLUME, HAS BEEN REPLACED WITH ACETIC ACID.
Inventors
- 👤 Andrew Beelik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:29
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/003
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |