Patent US3652200A successfully refreshed from Google Patents.
US3652200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrated sulfuric acid-dye solution dyeing
Assignee: Individual
•
Filing: 1969-09-23
•
Granted: 1972-03-28
•
Expires: 1989-09-23
Abstract
Abstract Various types of fibers, especially fibers which can ordinarily only be dyed with some difficulty, are dyed in a relatively short period of time at a relatively low temperature by using a dye bath in which the dye is dissolved in concentrated sulfuric acid, and in which a buffering compound, such as an alkali salt of a weak acid, is preferably added.
Inventors
- 👤 Kazuo Miyasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:15
CPC Classifications
D; D06; D06P; D06P3/00; D06P1/00; D06P1/81; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917; Y10S8/92; Y10S8/922; Y10S8/924; Y10S8/926; Y10S8/927; Y10S8/928
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
The process of claim 1, wherein an alkali salt of a weak inorganic or organic acid of more than 40 percent concentration by weight of solution buffering compound is added to the dye bath.
Claim 2
Dependent Claim
20 words
The process of claim 1, wherein the dye bath is maintained at a temperature of up to about 70* C.
Claim 3
Dependent Claim
26 words
The process of claim 1, wherein sodium citrate or sodium tartarate is added to said dye bath containing the sulfuric acid and the inorganic buffering compound.
Claim 4
Dependent Claim
108 words
A process for quick dyeing which comprises preparing a dye bath by dissolving into sulfuric acid of more than 60 percent concentration, a dye which is soluble and non-reactive with said acid, 26 passing a fiber or film through said dye bath whereby the film is diffused into the internal structure of said substance, wherein said dye bath is maintained at a temperature of up to about 70* C., contacting said treated fiber or film with water or an alkali solution so as to generate sufficient thermal energy to fix the dye into the internal structure of the fiber or film, washing and drying said fiber or film.
References Cited (Backward Citations)
US542046A
Cited
US2400720A
Cited
US2684812A
Cited
US3154613A
Cited
US3346322A
Cited
US3129053A
Cited
US3391985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |