Patent US4045169A successfully refreshed from Google Patents.
US4045169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-[3',4'-Dichloro-6'-alkyl-phenyl]-Δ 2-pyrazoline derivatives and their use as optical brighteners
Assignee: Hoechst AG
•
Filing: 1976-02-18
•
Granted: 1977-08-30
•
Expires: 1996-02-18
Abstract
Abstract Novel pyrazolines are obtained by condensation of substituted propionphenones or vinyl-phenyl-ketones with substituted phenyl hydrazines. The products are useful as optical brighteners of a great variety of the shade of their fluorescence and of an improved fastness to light.
Inventors
- 👤 Helmut Mengler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; D; D06; D06L; D06L4/00; D06L4/60; Y; Y10; Y10S; Y10S8/00; Y10S8/907; Y10S8/908; Y10S8/91; Y10S8/912; Y10S8/92; Y10S8/927; Y10S8/929
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
A compound of the formula ##STR14## in which R is alkyl of 1 to 4 carbon atoms and R 1 is alkyl of 1 to 20 carbon atoms.
Claim 2
Dependent Claim
28 words
A compound of the formula ##STR14## in which R is alkyl of 1 to 4 carbon atoms and R 1 is alkyl of 1 to 20 carbon atoms.
Claim 3
Dependent Claim
13 words
The compound of claim 1 wherein R and R 1 are both methyl.
Claim 4
Dependent Claim
21 words
The compound of claim 1 wherein R is CH 3 and R 1 is (CH 2 ) 17 CH 3 .
Claim 5
Dependent Claim
21 words
A process for optically brightening synthetic fibers which comprises incorporating into the synthetic fibers a compound as defined in claim 1.
Claim 6
Dependent Claim
21 words
A process for optically brightening synthetic fibers which comprises contacting the synthetic fibers with a compound as defined in claim 1.
Claim 7
Dependent Claim
20 words
A process for optically brightening synthetic fibers which comprises incorporating into the synthetic fibers the compound defined in claim 2.
Claim 8
Dependent Claim
20 words
A process for optically brightening synthetic fibers which comprises incorporating into the synthetic fibers the compound defined in claim 3.
Claim 9
Dependent Claim
20 words
A process for optically brightening synthetic fibers which comprises contacting the synthetic fibers with the compound defined in claim 2.
Claim 10
Dependent Claim
20 words
A process for optically brightening synthetic fibers which comprises contacting the synthetic fibers with the compound defined in claim 3.
References Cited (Backward Citations)
CH405326A
Cited
US3378389A
Cited
DE1445705A1
Cited
US3639419A
Cited
US3755352A
Cited
DE2434162A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |