US3844712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of dyed polyamides
Assignee: Bayer AG
•
Filing: 1969-02-04
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Granted: 1974-10-29
•
Expires: 1989-02-04
Abstract
Abstract The wet fastness of polyamides dyed with cationic dyes is improved by treatment with an aqueous solution containing soluble salts of the condensation product of formaldehyde and an aromatic sulfonic acid.
Inventors
- 👤 G Frickenhaus
- 👤 H Otten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:59
CPC Classifications
D; D06; D06P; D06P5/00; D06P5/02; D06P5/04; D06P1/00; D06P1/44; D06P1/62; D06P1/621; D06P1/622; D06P1/625
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
PROCESS FOR THE IMPROVEMENT OF THE WET FASTNESS PROPERTIES OF ANIONICALLY MODIFIED SYNTHETIC POLYAMIDE TESTILE MATERIALS DYED WITH CATIONIC DYESTUFFS COMPRISING TREATING THE MATERIALS WITH AQUEOUS LIQUORS, WHICH CONTAIN ALKALI OR AMMONIUM SALTS OF FORMALDEHYDE CONDENSATION PRODUCTS OF AROMATIC SULFONIC ACIDS OF THE FORMULA:
Claim 2
Dependent Claim
44 words
PROCESS FOR THE IMPROVEMENT OF THE WET FASTNESS PROPERTIES OF ANIONICALLY MODIFIED SYNTHETIC POLYAMIDE TESTILE MATERIALS DYED WITH CATIONIC DYESTUFFS COMPRISING TREATING THE MATERIALS WITH AQUEOUS LIQUORS, WHICH CONTAIN ALKALI OR AMMONIUM SALTS OF FORMALDEHYDE CONDENSATION PRODUCTS OF AROMATIC SULFONIC ACIDS OF THE FORMULA:
Claim 3
Dependent Claim
8 words
Process of claim 1 wherein m is 0.
Claim 4
Dependent Claim
12 words
Process of claim 1 wherein R is methyl and m is 2.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |