US2521340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching of cellulosic textiles
Assignee: Mathieson Chemical Corp
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Filing: 1945-05-16
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Granted: 1950-09-05
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Expires: 1965-05-16
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN THE BLEACHING OF CELLULOSIC TEXTILE BY TREATING THE TEXTILE WITH AN AQUEOUS SOLUTION OF A CHLORITE ACTIVATED BY THE PRESENCE OF A HYPOCHLORITE AND HAVING A PH NOT LESS THAN 7, THE IMPROVEMENT WHICH COMPRISES EFFECTING BLEACHING OF THE TEXTILE WITH SAID SOLUTION AT A TEMPERATURE IN EXCESS OF 100*F. WITHOUT APPRECIABLY DIMINISHING ACTIVATION OF THE CHLORITE BY DECOMPOSITION OF THE HYPOCHLORITE, AND BLEACHING BEING EFFECTED BY IMPREGNATING THE TEXTILE WITH SAID SOLUTION AND STEAMING THE IMPREGNATED TEXTILE IN THE PRESENCE OF ONLY SO MUCH OF THE SOLUTION AS IS RETAINED IN THE TEXTILE, FOR A PERIOD OF TIME SUFFICIENT TO EFFECT THE DESIRED BLEACHING.
Claim 2
Dependent Claim
106 words
IN THE BLEACHING OF CELLULOSIC TEXTILE BY TREATING THE TEXTILE WITH AN AQUEOUS SOLUTION OF A CHLORITE ACTIVATED BY THE PRESENCE OF A HYPOCHLORITE AND HAVING A PH NOT LESS THAN 7, THE IMPROVEMENT WHICH COMPRISES EFFECTING BLEACHING OF THE TEXTILE WITH SAID SOLUTION AT A TEMPERATURE IN EXCESS OF 100*F. WITHOUT APPRECIABLY DIMINISHING ACTIVATION OF THE CHLORITE BY DECOMPOSITION OF THE HYPOCHLORITE, AND BLEACHING BEING EFFECTED BY IMPREGNATING THE TEXTILE WITH SAID SOLUTION AND STEAMING THE IMPREGNATED TEXTILE IN THE PRESENCE OF ONLY SO MUCH OF THE SOLUTION AS IS RETAINED IN THE TEXTILE, FOR A PERIOD OF TIME SUFFICIENT TO EFFECT THE DESIRED BLEACHING.
References Cited (Backward Citations)
FR592135A
Cited
US2029985A
Cited
US2194358A
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US2334066A
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US2189378A
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US2267718A
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GB552711A
Cited
GB552567A
Cited
GB561834A
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US2383900A
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US2358866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |