US3849065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rhodamine dye solutions
Assignee: BASF SE
•
Filing: 1972-07-24
•
Granted: 1974-11-19
•
Expires: 1992-07-24
Abstract
Abstract Stable concentrated rhodamine dye solutions containing one or more rhodamine dyes esterified with a glycol or glycol derivative. The solutions are particularly suitable for dyeing paper.
Inventors
- 👤 K Schmeidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:23
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28; C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; C09B11/28; C09B67/00; C09B67/0071; C09B67/0075; C09B67/0076; C09B67/0077; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A STABLE HIGHLY CONCENTRATION SOLUTION OF AN ESTERIFIED RHODAMINE DYE OF THE FORMULA (A) 2,7-DI(CH3-),3-(C2H5-N(+)=),6-(C2H5-NH-), 9-(2-(R-O-CH2-CH2-OOC-)PHENYL)-3H-XANTHENE . R1-SO4(-) IN WHICH R IS HYDROGEN, ACETYL, PROPIONLY, ALKYL OF ONE TO FOUR CARBON ATOMS OR A RADICAL OF THE FORMULA (CH2CH2O)NR2; N IS THE INTEGER 1 OR 2; R1 IS HYDROGEN, METHYL OR ETHYL; AND R2 IS HYDROGEN, ACETYL, PROPIONYL OR ALKYL OF ONE TO FOUR CARBON ATOMS,
Claim 2
Dependent Claim
66 words
A STABLE HIGHLY CONCENTRATION SOLUTION OF AN ESTERIFIED RHODAMINE DYE OF THE FORMULA (A) 2,7-DI(CH3-),3-(C2H5-N(+)=),6-(C2H5-NH-), 9-(2-(R-O-CH2-CH2-OOC-)PHENYL)-3H-XANTHENE . R1-SO4(-) IN WHICH R IS HYDROGEN, ACETYL, PROPIONLY, ALKYL OF ONE TO FOUR CARBON ATOMS OR A RADICAL OF THE FORMULA (CH2CH2O)NR2; N IS THE INTEGER 1 OR 2; R1 IS HYDROGEN, METHYL OR ETHYL; AND R2 IS HYDROGEN, ACETYL, PROPIONYL OR ALKYL OF ONE TO FOUR CARBON ATOMS,
Claim 3
Dependent Claim
15 words
A stable highly concentrated solution of esterified rhodamine dyes of the formulae (A) and (B)
Claim 4
Dependent Claim
15 words
A stable highly concentrated solution of esterified rhodamine dyes of the formulae (A) and (B)
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |