Patent US3770371A successfully refreshed from Google Patents.
US3770371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable aqueous dispersions of cationic dyestuffs
Assignee: Novartis AG
•
Filing: 1971-08-25
•
Granted: 1973-11-06
•
Expires: 1991-08-25
Abstract
Abstract Stable aqueous dispersions of cationic or anionic dyestuffs which are, per se, water-soluble, which dispersions contain a stabilizing agent in an amount of up to about 15 percent of their weight, the balance consisting of (a) water and, dissolved in the latter, (b) an at least sparingly water-soluble salt consisting of the anion of an inorganic or organic acid and of the cation of an inorganic base, and, in the case of said dyestuff being cationic, (c) acid selected from inorganic and organic acids, the pK values of which acids are at most 4.8, the concentration of the said salt in the water being high enough to keep the dyestuff practically undissolved.
Inventors
- 👤 W Bossard
- 👤 F Favre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:58
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0075
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The dispersion as defined in claim 1, wherein the acid defined under (b) is formic or acetic acid.
Claim 2
Dependent Claim
28 words
The dispersion as defined in claim 2, wherein the water-soluble salt is sodium chloride, the acid is acetic acid and the stabilizer is a fatty alcohol polyglycol ether.
Claim 3
Dependent Claim
28 words
The dispersion as defined in claim 2, wherein the water-soluble salt is magnesium chloride, the acid is acetic acid and the stabilizer is a fatty alcohol polyglycol ether.
Claim 4
Dependent Claim
14 words
The dispersion as defined in claim 1, wherein the stabilizer is a non-ionic stabilizer.
Claim 5
Dependent Claim
25 words
The dispersion as defined in claim 1, wherein the content of salt component (e) in the dispersion is 5-25 percent by weight of the dispersion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |