US3345250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching pulp without direct chlorination by bleaching with chlorine dioxide
Assignee: International Paper Co
•
Filing: 1966-06-30
•
Granted: 1967-10-03
•
Expires: 1986-06-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Amiel W Brinkley
- 👤 Jack F Kilborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:15
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12; D21C9/14; D21C9/144; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/23; D06L4/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN A PROCESS OF PREPARING WOOD PULP BY SUBJECTING IT TO A SEQUENCE OF BLEACHING AND CAUSTIC EXTRACTION STEPS WITHOUT DIRECT CHLORINATION, THE STEP OF BLEACHING THE PULP FIRST WITH CHLORINE DIOXIDE UNDER ACID CONDITIONS PRODUCED BY THE ADDITION OF AN ACID TO THE PULP AND THEN WITH AT LEAST ONE HYPOCHLORITE.
Claim 2
Dependent Claim
52 words
IN A PROCESS OF PREPARING WOOD PULP BY SUBJECTING IT TO A SEQUENCE OF BLEACHING AND CAUSTIC EXTRACTION STEPS WITHOUT DIRECT CHLORINATION, THE STEP OF BLEACHING THE PULP FIRST WITH CHLORINE DIOXIDE UNDER ACID CONDITIONS PRODUCED BY THE ADDITION OF AN ACID TO THE PULP AND THEN WITH AT LEAST ONE HYPOCHLORITE.
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |