Patent US3900419A successfully refreshed from Google Patents.
US3900419A
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Benzofurans
Assignee: Novartis Corp
•
Filing: 1973-07-16
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Granted: 1975-08-19
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Expires: 1993-07-16
Abstract
Abstract 2-Substituted benzofurans which can be further substituted are prepared by known methods. Said compounds are useful as brighteners of high-molecular organic materials.
Inventors
- 👤 Hans Schlapfer
- 👤 Guglielmo Kabas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/91; C07D307/78; C07D307/82; C07D307/84; C07D307/85; C07D307/92; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
41 words
IN A PROCESS FOR OPTICALLY BRIGHTENING A HIGH MOLECULAR WEIGHT ORGANIC MATERIAL BY CONTACTING SAID MATERIAL WITH AN OPTICAL BRIGHTENER, THE IMPROVEMENT COMPRISING CONTACTING SAID MATERIAL WITH AN EFFECTIVE AMOUNT OF A SOLUTION OR DISPERSION OF A BENZOFURAN OF THE FORMULA
Claim 2
Dependent Claim
41 words
IN A PROCESS FOR OPTICALLY BRIGHTENING A HIGH MOLECULAR WEIGHT ORGANIC MATERIAL BY CONTACTING SAID MATERIAL WITH AN OPTICAL BRIGHTENER, THE IMPROVEMENT COMPRISING CONTACTING SAID MATERIAL WITH AN EFFECTIVE AMOUNT OF A SOLUTION OR DISPERSION OF A BENZOFURAN OF THE FORMULA
Claim 3
Dependent Claim
17 words
The process according to claim 1 in which the high molecular weight material is a textile fibre.
Claim 4
Dependent Claim
16 words
The process according to claim 2 in which the textile fibre is a synthetic textile fibre.
Claim 5
Dependent Claim
14 words
The process according to claim 3 in which the synthetic textile fibre is polyacrylonitrile.
Claim 6
Dependent Claim
25 words
The process according to claim 2 in which the solution or dispersion contains 0.005 to 0.5% of said benzofuran with reference to the fibre material.
Claim 7
Dependent Claim
40 words
In a process for optically brightening a high molecular weight organic synthetic polymer mass by incorporating an optical brightener in said polymer mass, the improvement comprising incorporating into said polymer mass an effective amount of a benzofuran of the formula
Claim 8
Dependent Claim
40 words
In a process for optically brightening a high molecular weight organic synthetic polymer mass by incorporating an optical brightener in said polymer mass, the improvement comprising incorporating into said polymer mass an effective amount of a benzofuran of the formula
Claim 9
Dependent Claim
21 words
The process according to claim 6 in which the amount of benzofuran added is 0.001 to 1% of the polymer mass.
Claim 10
Dependent Claim
13 words
The process according to claim 7 in which the polymer mass is polypropylene.
Claim 11
Dependent Claim
17 words
An optically brightening composition comprising an effective amount, for optically brightening, of a benzofuran of the formula
Claim 12
Dependent Claim
17 words
An optically brightening composition comprising an effective amount, for optically brightening, of a benzofuran of the formula
Claim 13
Dependent Claim
23 words
A composition according to claim 9 wherein the carrier is water and the composition is an aqueous solution or dispersion of the benzofuran.
Claim 14
Dependent Claim
20 words
A composition according to claim 10 wherein the composition is a dispersion containing from 0.2 to 0.5% of the benzofuran.
Claim 15
Dependent Claim
38 words
A composition according to claim 9 wherein the carrier is selected from the group consisting of water, lower alkanols, lower alkoxyalkanols or lower aliphatic ketones and the composition is in the form of a solution of the benzofuran.
Claim 16
Dependent Claim
36 words
An optically brightened composition comprising a material selected from the group consisting of wool, cotton, polyesters, polyolefins, polyamides, polyvinylchloride, cellulose esters and polyacrylonitrile, and an effective amount, for optically brightening, of a benzofuran of the formula
Claim 17
Dependent Claim
36 words
An optically brightened composition comprising a material selected from the group consisting of wool, cotton, polyesters, polyolefins, polyamides, polyvinylchloride, cellulose esters and polyacrylonitrile, and an effective amount, for optically brightening, of a benzofuran of the formula
Claim 18
Dependent Claim
18 words
A composition according to claim 13 wherein the amount of benzofuran is 0.001% to 1% of the material.
Claim 19
Dependent Claim
28 words
A composition according to claim 13 wherein the material is a synthetic textile material selected from the group consisting of polyesters, polyolefins, polyamides, polyvinylchloride, cellulose esters and polyacrylonitrile.
Claim 20
Dependent Claim
11 words
A composition according to claim 15 wherein the material is polyacrylonitrile.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |