US2571990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyeing process for cellulose fibers
Assignee: GAF Chemicals Corp
•
Filing: 1947-12-30
•
Granted: 1951-10-16
•
Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Stratton Charles Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:21
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/50; C09B35/56; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR PRODUCING A COLORATION ON CELLULOSIC FIBER OF OUTSTANDING FASTNESS TO WASHING, WHICH COMPRISES DYEING SAID FIBER DIRECTLY WITH AN AQUEOUS SOLUTION OF A POLYAZO COMPOUND HAVING IN FREE ACID FORM THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
37 words
A PROCESS FOR PRODUCING A COLORATION ON CELLULOSIC FIBER OF OUTSTANDING FASTNESS TO WASHING, WHICH COMPRISES DYEING SAID FIBER DIRECTLY WITH AN AQUEOUS SOLUTION OF A POLYAZO COMPOUND HAVING IN FREE ACID FORM THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2164785A
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US1183378A
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US1505569A
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US1737905A
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US1857230A
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GB262987A
Cited
US1877303A
Cited
FR801094A
Cited
US2267770A
Cited
US2283829A
Cited
US2394246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |