US4562604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dyeing cellulose fiber material by controlled addition of alkaline material
Assignee: Hoechst AG
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Filing: 1984-03-14
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Granted: 1986-01-07
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Expires: 2004-03-14
Abstract
Abstract Method for dyeing cellulose fibers in a bath containing a reactive dyeing agent and an alkaline material for fixation thereof, by progressively adding the alkaline material to the bath in a continuous and automatic manner over a predetermined time interval, the amount of alkaline material added being limited initially and increased in a final phase of addition until a sufficient amount is added to fix the dyeing agent.
Inventors
- 👤 Sture Damm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:43
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/66; D06B; D06B23/00; D06B23/20; D06B3/00; D06B3/28; D06P1/00; D06P1/0032; D06B23/205
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A method for dyeing cellulose fibers and mixtures thereof with other fibers in a bath containing at least one reactive dyeing agent in the presence of an alkaline material for fixation of said dyeing agent on said cellulose fibers, comprising establishing a bath containing said cellulose fibers and said dyeing agent, progressively adding to said bath in substantially continuous manner and over a predetermined time interval an alkaline material, the amount of said alkaline material being limited in an intitial phase of said time interval and increased to a largest amount in a final phase of said time interval, and automatically controlling said addition according to a predetermined function of time until a sufficient amount of alkaline material has been added to fix said dyeing agent on said cellulose fibers.
Claim 2
Independent Claim
130 words
A method for dyeing cellulose fibers and mixtures thereof with other fibers in a bath containing at least one reactive dyeing agent in the presence of an alkaline material for fixation of said dyeing agent on said cellulose fibers, comprising establishing a bath containing said cellulose fibers and said dyeing agent, progressively adding to said bath in substantially continuous manner and over a predetermined time interval an alkaline material, the amount of said alkaline material being limited in an intitial phase of said time interval and increased to a largest amount in a final phase of said time interval, and automatically controlling said addition according to a predetermined function of time until a sufficient amount of alkaline material has been added to fix said dyeing agent on said cellulose fibers.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein said alkaline material is selected from the group consisting of caustic soda, sodium bicarbonate, sodium carbonate, trisodium phosphate, sodium metasilicate, and mixtures thereof.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein the degree of fixation of said dyeing agent is substantially proportional to the time interval for addition of said alkaline material.
References Cited (Backward Citations)
US4350494A
Cited
US4483032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |