Patent US3703372A successfully refreshed from Google Patents.
Patent US3790343A successfully refreshed from Google Patents.
US3790343A
Expired / Lapsed
US
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Method for bleaching fibrous materials and compositions therefor
Assignee: Individual
•
Filing: 1971-12-10
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Granted: 1974-02-05
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Expires: 1991-12-10
Abstract
Abstract A bleaching composition for a fibrous material comprises an aqueous medium having dissolved therein sodium chlorite and sodium polyphosphate, said sodium polyphosphate being such that the molar ratio of Na2O to P2O5 is greater than 0.1 but less than 1.0 and that a 1 weight percent aqueous solution thereof has a pH of not higher than 3; and a method for bleaching a fibrous material comprises bleaching a fibrous material with said composition.
Inventors
- 👤 S Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24; D06L4/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
The bleaching method according to claim 1, in which said molar ratio of the sodium polyphosphate is in the range of 0.3 to 0.8.
Claim 2
Dependent Claim
32 words
The bleaching method according to claim 1, in which said sodium polyphosphate is present in an amount of 1.0 to 3.0 times the weight of the ClO contained in the sodium chlorite.
References Cited (Backward Citations)
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Cited
US2900219A
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US3173749A
Cited
US3063782A
Cited
US3111358A
Cited
US3378341A
Cited
US3547573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |