US2890093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing acrylic fibers
Assignee: GAF Chemicals Corp
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Filing: 1955-12-15
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Granted: 1959-06-09
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Expires: 1975-12-15
Abstract
No abstract record available.
Inventors
- 👤 Henry R Mautner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:13
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67383; D06P1/67333; D06P1/6735; D06P3/00; D06P3/70; D06P3/701; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927; Y10S8/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
2. IN A PROCESS FOR DYEING FIBROUS MATERIALS CONTAINING FIBRES COMPOSED OF AT LEAST 75% BY WEIGHT OF POLYACRYLONITRILE, THE IMPROVEMENT COMPRISING PRETREATING SAID MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING ABOUT 8 TO 25* OF SODIUM TETRABORATE BY WEIGHT OF THE FIBRE, ADDING TO SAID SOLUTION CONTAINING THE PRETREATED MATERIAL A VAT DYESTUFF SOLUBLE IN REDUCED FORM IN AN AQUEOUS ALKALINE HYDROSULFITE VAT AND STABLE AT ABOUT 205 TO 220* F., AND THEN ADDING TO SAID SOLUTION SUFFICIENT CAUSTIC SODA AND SODIUM HYDROSULFITE TO FORM AND MAINTAIN THE DYESTUFF IN REDUCED FORM IN THE BATH WHILE DYEING THE PRETREATED MATERIAL IN THE BATH AT ABOUT 205 TO 220*F.
Claim 2
Dependent Claim
108 words
2. IN A PROCESS FOR DYEING FIBROUS MATERIALS CONTAINING FIBRES COMPOSED OF AT LEAST 75% BY WEIGHT OF POLYACRYLONITRILE, THE IMPROVEMENT COMPRISING PRETREATING SAID MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING ABOUT 8 TO 25* OF SODIUM TETRABORATE BY WEIGHT OF THE FIBRE, ADDING TO SAID SOLUTION CONTAINING THE PRETREATED MATERIAL A VAT DYESTUFF SOLUBLE IN REDUCED FORM IN AN AQUEOUS ALKALINE HYDROSULFITE VAT AND STABLE AT ABOUT 205 TO 220* F., AND THEN ADDING TO SAID SOLUTION SUFFICIENT CAUSTIC SODA AND SODIUM HYDROSULFITE TO FORM AND MAINTAIN THE DYESTUFF IN REDUCED FORM IN THE BATH WHILE DYEING THE PRETREATED MATERIAL IN THE BATH AT ABOUT 205 TO 220*F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |