Patent US2914374A successfully refreshed from Google Patents.
US2914374A
Expired / Lapsed
US
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Bleaching of keratinous fibrous material
Assignee: Harris Research Laboratories Inc
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Filing: 1954-03-24
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Granted: 1959-11-24
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Expires: 1974-03-24
Abstract
No abstract record available.
Inventors
- 👤 Harris Milton
- 👤 Alfred E Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:22
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/51; D06M11/54; D06L; D06L4/00; D06L4/10; D06L4/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE METHOD OF BLEACHING PIGMENTED NATURAL KERATINOUS FIBERS WHICH COMPRISES TREATING SAID FIBERS FOR FROM 10 TO 150 MINUTES WITH AN AQUEOUS SOLUTION AT A TEMPERAURE OF 150* TO 212*F. AND A PH IN THE RANGE 2.8-9.5, SAID AQUEOUS SOLUTION COMPRISING AN INORGANIC, WATERSOLUBLE INONIZABLE FERROUS SALT IN AN AMOUNT EQUIVALENT TO 0.6% TO 10% FERROUS SULFATE, AND 1.4% TO 18.6% FREE FORMALDEHYDE, BOTH ON THE WEIGHT OF THE SAID FIBERS, AND THEREAFTER TREATING SAID FIBERS FOR FROM ABOUT 0.5 TO ABOUT 5 HOURS WITH AN AQUEOUS BLEACHING SOLUTION AT A TEMPERATURE OF 120*F. TO 195*F. AND A PH IN THE RANGE 7.0-9.0, SAID AQUEOUS BLEACHING SOLUTION CONTAINING 6% TO 40% HYDROGEN PEROXIDE CALCULATED AS 100% H2O2 BY WEIGHT ON SAID FIBERS.
Claim 2
Independent Claim
122 words
THE METHOD OF BLEACHING PIGMENTED NATURAL KERATINOUS FIBERS WHICH COMPRISES TREATING SAID FIBERS FOR FROM 10 TO 150 MINUTES WITH AN AQUEOUS SOLUTION AT A TEMPERAURE OF 150* TO 212*F. AND A PH IN THE RANGE 2.8-9.5, SAID AQUEOUS SOLUTION COMPRISING AN INORGANIC, WATERSOLUBLE INONIZABLE FERROUS SALT IN AN AMOUNT EQUIVALENT TO 0.6% TO 10% FERROUS SULFATE, AND 1.4% TO 18.6% FREE FORMALDEHYDE, BOTH ON THE WEIGHT OF THE SAID FIBERS, AND THEREAFTER TREATING SAID FIBERS FOR FROM ABOUT 0.5 TO ABOUT 5 HOURS WITH AN AQUEOUS BLEACHING SOLUTION AT A TEMPERATURE OF 120*F. TO 195*F. AND A PH IN THE RANGE 7.0-9.0, SAID AQUEOUS BLEACHING SOLUTION CONTAINING 6% TO 40% HYDROGEN PEROXIDE CALCULATED AS 100% H2O2 BY WEIGHT ON SAID FIBERS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |