US3177111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypochlorite sulfamic acid process of bleaching cellulosic materials
Assignee: Weyerhaeuser Co
•
Filing: 1962-12-06
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Granted: 1965-04-06
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Expires: 1982-12-06
Abstract
No abstract record available.
Inventors
- 👤 Lee E Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1036; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF BLEACHING CELLULOSIC MATERIALS WHICH COMPRISES REACTING THE CELLULOSIC MATERIAL IN FINELY DIVIDED FORM AND IN AN AQUEOUS MEDIUM WITH A BLEACHING QUANTITY OF AN INORGANIC HYPOCHLORITE BLEACHING AGENT AND FROM 1-50% BY WEIGHT, BASED ON THE WEIGHT OF AVAILABLE CHLORINE IN SAID BLEACHING AGENT, OF SULFAMIC ACID, THE REACTION BEING CARRIED OUT UNTIL THE PREDETERMINED DEGREE OF BLEACHING OF THE CELLULOSIC MATERIAL HAS BEEN OBTAINED.
Claim 2
Dependent Claim
68 words
THE PROCESS OF BLEACHING CELLULOSIC MATERIALS WHICH COMPRISES REACTING THE CELLULOSIC MATERIAL IN FINELY DIVIDED FORM AND IN AN AQUEOUS MEDIUM WITH A BLEACHING QUANTITY OF AN INORGANIC HYPOCHLORITE BLEACHING AGENT AND FROM 1-50% BY WEIGHT, BASED ON THE WEIGHT OF AVAILABLE CHLORINE IN SAID BLEACHING AGENT, OF SULFAMIC ACID, THE REACTION BEING CARRIED OUT UNTIL THE PREDETERMINED DEGREE OF BLEACHING OF THE CELLULOSIC MATERIAL HAS BEEN OBTAINED.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |