US3348903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrazine as an anti-staining agent for a peroxide bleaching solution
Assignee: Evonik Operations GmbH
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Filing: 1964-02-06
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Granted: 1967-10-24
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Baier Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:40
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10; D06L4/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A PROCESS FOR BLEACHING TEXTILE FABRICS WITH AQUEOUS PEROXIDIC BLEACHING LIQUORS WHICH FABRICS HAVE FERROUS METAL PARTICLES THEREIN LIKELY TO CAUSE CATALYTIC INJURY TO SUCH FABRICS DURING THE BLEACHING WITH THE AQUEOUS PEROXIDIC BLEACHING LIQUOR, THE STEP OF TREATING SAID FABRICS WITH AT LEAST ONE HYDRAZINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE HYDRATE AND HYDRAZINE SALTS IN AN AQUEOUS MEDIUM AT A POINT NOT LATER THAN SAID BLEACHING PROCESS WITH THE AQUEOUS PEROXIDIC BLEACHING LIQUOR, THE AMOUNT OF SAID HYDRAZINE COMPOUND EMPLOYED IN SAID TREATMENT BEING SUFFICIENT TO PREVENT ANY CATALYTIC INJURY TO THE FABRICS CAUSED BY SAID PRESENCE OF FERROUS METAL PARTICLES.
Claim 2
Dependent Claim
106 words
IN A PROCESS FOR BLEACHING TEXTILE FABRICS WITH AQUEOUS PEROXIDIC BLEACHING LIQUORS WHICH FABRICS HAVE FERROUS METAL PARTICLES THEREIN LIKELY TO CAUSE CATALYTIC INJURY TO SUCH FABRICS DURING THE BLEACHING WITH THE AQUEOUS PEROXIDIC BLEACHING LIQUOR, THE STEP OF TREATING SAID FABRICS WITH AT LEAST ONE HYDRAZINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE HYDRATE AND HYDRAZINE SALTS IN AN AQUEOUS MEDIUM AT A POINT NOT LATER THAN SAID BLEACHING PROCESS WITH THE AQUEOUS PEROXIDIC BLEACHING LIQUOR, THE AMOUNT OF SAID HYDRAZINE COMPOUND EMPLOYED IN SAID TREATMENT BEING SUFFICIENT TO PREVENT ANY CATALYTIC INJURY TO THE FABRICS CAUSED BY SAID PRESENCE OF FERROUS METAL PARTICLES.
References Cited (Backward Citations)
GB846079A
Cited
US3111358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |