US4369213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing indigo-dyeable polyester fibers
Assignee: EIDP Inc
•
Filing: 1982-05-12
•
Granted: 1983-01-18
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Expires: 2002-05-12
Abstract
Abstract Cross-linked polyvinyl alcohol coated polyester fiber is indigo-dyeable and exhibits wash-down and crocking resistance characteristics similar to indigo-dyed cotton fibers.
Inventors
- 👤 Robert L. Adelman
- 👤 John J. P. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:17
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/327; D06M15/333; Y; Y10; Y10S; Y10S8/00; Y10S8/04; Y10S8/92; Y10S8/922; Y10S8/93
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A process for preparing indigo-dyeable polyester fiber comprising applying to the fiber a coating of polyvinyl alcohol and a water-soluble polyamide containing secondary amino groups in the polymer chain which have been reacted with epichlorohydrin and curing the coating.
Claim 2
Dependent Claim
39 words
A process for preparing indigo-dyeable polyester fiber comprising applying to the fiber a coating of polyvinyl alcohol and a water-soluble polyamide containing secondary amino groups in the polymer chain which have been reacted with epichlorohydrin and curing the coating.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein the polyvinyl alcohol and water-soluble polyamide are added in the proportion of 80/20 and 95/5 wt. ratio and at a level of between about 0.25 and 2% of active ingredient based on the weight of the fiber.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the molecular weight of the polyvinyl alcohol is between about 40,000 and 115,000.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the curing is effected at temperatures of 120° C. to 140° C. for about 5 to 10 minutes.
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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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |