Patent US2520105A successfully refreshed from Google Patents.
US2520105A
Expired / Lapsed
US
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Metachrome dyeing procedure
Assignee: Wyeth Holdings LLC
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Filing: 1947-05-27
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Granted: 1950-08-22
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Expires: 1967-05-27
Abstract
No abstract record available.
Inventors
- 👤 Henry E Millson
- 👤 Chester A Amick
- 👤 Willard H Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:43
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/60; D06P1/607; D06P1/67341; D06P3/00; D06P3/02; D06P3/04; D06P3/14; D06P3/20; Y; Y10; Y10S; Y10S8/00; Y10S8/907; Y10S8/916; Y10S8/917; Y10S8/92; Y10S8/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF DYEING WHICH COMPRISES SUBJECTING SUBSTNATIALLY UNMETALLIZED BASIC NITROGENOUS FIBERS TO THE ACTION OF A DYE BATH FORMED BY MIXING A CHROMABLE DYE, A SOLUBLE CHROMIUM CONTAINING SALT, A SOLUBLE ALKALINE EARTH METAL SALT, A WATER-DISPERSIBLE SURFACE-ACTIVE COMPOSITION CONTAINING AT LEAST ONE CATIONIC SURFACE ACTIVE AGENT, WATER, AND SUFFICIENT ALKALI TO MAKE THE BATH ALKALINE AND TO CAUSE SAID DYE TO REACT WITH SAID ALKALINE EARTH METAL SALT TO FORM AN ALKALINE EARTH METAL COMPLEX OF SAID DYE AND INSUFFICIENT TO MATERIALLY DAMAGE THE FIBERS, PARTIALLY DYEING SAID FIBERS FROM SAID COMPLEX, GRADUALLY LOWERING THE PH OF SAID BATH TO A POINT WHERE DECOMPOSITION OF SAID COMPLEX AND CHROMATION TAKE PLACE, AND COMPLETING THE DYEING AT SAID LOWERED PH.
Claim 2
Independent Claim
121 words
A METHOD OF DYEING WHICH COMPRISES SUBJECTING SUBSTNATIALLY UNMETALLIZED BASIC NITROGENOUS FIBERS TO THE ACTION OF A DYE BATH FORMED BY MIXING A CHROMABLE DYE, A SOLUBLE CHROMIUM CONTAINING SALT, A SOLUBLE ALKALINE EARTH METAL SALT, A WATER-DISPERSIBLE SURFACE-ACTIVE COMPOSITION CONTAINING AT LEAST ONE CATIONIC SURFACE ACTIVE AGENT, WATER, AND SUFFICIENT ALKALI TO MAKE THE BATH ALKALINE AND TO CAUSE SAID DYE TO REACT WITH SAID ALKALINE EARTH METAL SALT TO FORM AN ALKALINE EARTH METAL COMPLEX OF SAID DYE AND INSUFFICIENT TO MATERIALLY DAMAGE THE FIBERS, PARTIALLY DYEING SAID FIBERS FROM SAID COMPLEX, GRADUALLY LOWERING THE PH OF SAID BATH TO A POINT WHERE DECOMPOSITION OF SAID COMPLEX AND CHROMATION TAKE PLACE, AND COMPLETING THE DYEING AT SAID LOWERED PH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |