US4113427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing cellulosic textiles with vat and sulfur dyes
Assignee: Royce Chemical Co
•
Filing: 1976-04-26
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Granted: 1978-09-12
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Expires: 1996-04-26
Abstract
Abstract The specification describes an improved process for dyeing cellulosic textiles with vat and sulfur dyes using a reducing agent composition which has been stabilized against aerobic and anaerobic decomposition. This specification describes also the reducing agent composition which comprises sodium dithionite and a critical amount of sodium hydroxymethanesulfinate.
Inventors
- 👤 Andrew Fono
- 👤 Ray F. Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:59
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/221
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
32 words
A reducing agent composition for dyeing a cellulosic textile with a vat and sulfur dye which comprises about 85-97.5% by weight of sodium dithionite and about 2.5-15% by weight of sodium hydroxymethanesulfinate.
Claim 2
Dependent Claim
32 words
A reducing agent composition for dyeing a cellulosic textile with a vat and sulfur dye which comprises about 85-97.5% by weight of sodium dithionite and about 2.5-15% by weight of sodium hydroxymethanesulfinate.
Claim 3
Dependent Claim
25 words
The reducing agent composition according to claim 1 which comprises about 90-95% by weight of sodium dithionite and about 5-10% by weight of sodium hydroxymethanesulfinate.
Claim 4
Dependent Claim
20 words
The reducing agent composition according to claim 1 which further comprises about 5-15% sodium carbonate by weight of the composition.
Claim 5
Dependent Claim
29 words
The reducing agent composition according to claim 1 which further comprises a sufficient amount of water to provide an aqueous solution with about 2.5-15% of the reducing agent composition.
Claim 6
Dependent Claim
23 words
The reducing agent composition according to claim 1 which further comprises about 10-70% of an aldehyde-bisulfite addition product by weight of the composition.
Claim 7
Dependent Claim
14 words
The reducing agent composition according to claim 5 which comprises the acetaldehyde-bisulfite addition product.
Claim 8
Dependent Claim
52 words
A reducing agent composition for dyeing a cellulosic textile with a vat and sulfur dye which comprises about 90-95% by weight sodium dithionite, about 5-10% by weight sodium hydroxymethanesulfinate; said composition comprising about 5-15% by weight of sodium carbonate, and said composition further comprising about 10-70% by weight of acetaldehyde-bisulfite addition product.
Claim 9
Dependent Claim
52 words
A reducing agent composition for dyeing a cellulosic textile with a vat and sulfur dye which comprises about 90-95% by weight sodium dithionite, about 5-10% by weight sodium hydroxymethanesulfinate; said composition comprising about 5-15% by weight of sodium carbonate, and said composition further comprising about 10-70% by weight of acetaldehyde-bisulfite addition product.
Claim 10
Dependent Claim
40 words
In an improved process for dyeing a cellulosic textile with a vat and sulfur dye, the improvement which comprises adding a reducing agent composition comprising about 85-97.5% by weight of sodium dithionite and about 2.5-15% by weight of sodium hydroxymethanesulfinate.
Claim 11
Dependent Claim
40 words
In an improved process for dyeing a cellulosic textile with a vat and sulfur dye, the improvement which comprises adding a reducing agent composition comprising about 85-97.5% by weight of sodium dithionite and about 2.5-15% by weight of sodium hydroxymethanesulfinate.
Claim 12
Dependent Claim
27 words
The process according to claim 8 wherein the reducing agent composition comprises about 90-95% by weight of sodium dithionite and about 5-10% by weight of sodium hydroxymethanesulfinate.
Claim 13
Dependent Claim
21 words
The process according to claim 8 wherein the reducing agent composition comprises about 5-15% sodium carbonate by weight of the composition.
Claim 14
Dependent Claim
30 words
The process according to claim 8 wherein the reducing agent composition comprises a sufficient amount of water to provide an aqueous solution in about 2.5-15% of the reducing agent composition.
Claim 15
Dependent Claim
24 words
The process according to claim 8 wherein the reducing agent composition comprises about 10-70% of an aldehyde-bisulfite addition product by weight of the composition.
Claim 16
Dependent Claim
16 words
The process according to claim 12 wherein the reducing agent composition comprises the acetaldehyde-bisulfite addition product.
Claim 17
Dependent Claim
63 words
In an improved process for dyeing a cellulosic textile with a vat and sulfur dye, the improvement which comprises adding a reducing agent composition comprising about 90-95% by weight sodium dithionite and about 5-10% by weight sodium hydroxymethanesulfinate, said composition comprising about 5-15% by weight of sodium carbonate, and said composition further comprising about 10-70% by weight of acetaldehyde-bisulfite addition product is used.
Claim 18
Dependent Claim
63 words
In an improved process for dyeing a cellulosic textile with a vat and sulfur dye, the improvement which comprises adding a reducing agent composition comprising about 90-95% by weight sodium dithionite and about 5-10% by weight sodium hydroxymethanesulfinate, said composition comprising about 5-15% by weight of sodium carbonate, and said composition further comprising about 10-70% by weight of acetaldehyde-bisulfite addition product is used.
Claim 19
Dependent Claim
11 words
The process according to claim 8 wherein the dye is indigo.
Claim 20
Dependent Claim
11 words
The process according to claim 12 wherein the dye is indigo.
References Cited (Backward Citations)
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US3118724A
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US3265459A
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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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |