Patent US5275838A successfully refreshed from Google Patents.
US4780099A
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Method for producing stain resistant polyamide fibers
Assignee: Invista North America LLC
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Filing: 1986-08-26
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Granted: 1988-10-25
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Expires: 2006-08-26
Abstract
Abstract Polyamide fibers are made stain resistant by treating them with a sulfonated naphthol- or sulfonated phenol-formaldehyde condensation product. Applying the stain-resist compounds at pH values of between 1.5 and 2.5 renders them stable to yellowing upon exposure to agents in the environment such as NO 2 .
Inventors
- 👤 Imrich Greschler
- 👤 Creighton P. Malone
- 👤 Armand P. Zinnato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:43
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; D06M15/412; Y; Y10; Y10S; Y10S8/00; Y10S8/21; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23986
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
In a process for applying sulfonated phenol-formaldehyde or sulfonated naphthol-formaldehyde condensation products to polyamide textile articles to render them stain resistant, the improvement comprising applying the condensation products at a pH of between 1.5 and 2.5 whereby yellowing of the treated articles due to exposure to NO 2 in the atmosphere is reduced.
Claim 2
Dependent Claim
53 words
In a process for applying sulfonated phenol-formaldehyde or sulfonated naphthol-formaldehyde condensation products to polyamide textile articles to render them stain resistant, the improvement comprising applying the condensation products at a pH of between 1.5 and 2.5 whereby yellowing of the treated articles due to exposure to NO 2 in the atmosphere is reduced.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the textile article is a dyed polyamide fiber carpet.
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |