US2812322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing direct dyes
Assignee: Wyeth Holdings LLC
•
Filing: 1953-11-13
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Granted: 1957-11-05
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Expires: 1973-11-13
Abstract
No abstract record available.
Inventors
- 👤 Conn Robert Carland
- 👤 Friese George Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28; C; C09; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF IMPROVING THE CHARACTERISTICS OF DIRECT AZO DYES SELECTED FROM THE GROUP CONSISTING OF STILBENE YELLOW (COLOR INDEX 620), STILBENE ORANGE (COLOR INDEX 621), DIRECT BROWN (COLOR INDEX 420), DIRECT ORANGE (COLOR INDEX 415), AND DIRECT VIOLET (COLOR INDEX 394), WHICH COMPRISES SUBJECTING SAID AZO DYES TO MECHANICAL WORK IN AN APPARATUS OPERATING BY ATTRITION AND SHEARING, AS DISTINGUISHED FROM IMPACT.
Claim 2
Independent Claim
63 words
A METHOD OF IMPROVING THE CHARACTERISTICS OF DIRECT AZO DYES SELECTED FROM THE GROUP CONSISTING OF STILBENE YELLOW (COLOR INDEX 620), STILBENE ORANGE (COLOR INDEX 621), DIRECT BROWN (COLOR INDEX 420), DIRECT ORANGE (COLOR INDEX 415), AND DIRECT VIOLET (COLOR INDEX 394), WHICH COMPRISES SUBJECTING SAID AZO DYES TO MECHANICAL WORK IN AN APPARATUS OPERATING BY ATTRITION AND SHEARING, AS DISTINGUISHED FROM IMPACT.
References Cited (Backward Citations)
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Cited
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US2174954A
Cited
US2361301A
Cited
US2402167A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |