Patent US3795482A successfully refreshed from Google Patents.
US3795482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen peroxide and nitrite or nitrous acid oxidation of polyester fibers
Assignee: FMC Corp
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Filing: 1971-12-15
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Granted: 1974-03-05
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Expires: 1991-12-15
Abstract
Abstract This invention provides a process for treating polyester materials employing a treatment solution containing a synergistic combination of hydrogen peroxide values and nitrites (or nitrous acid) whereby the cotton-like hand of the polyester is improved and the polyester is made cationocally dyeable.
Inventors
- 👤 R Yelin
- 👤 J Frazier
- 👤 R Villiers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:05
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the treatment solution contains at least 0.2 percent of a water-soluble peroxydisulfate salt.
Claim 2
Dependent Claim
12 words
The process of claim 2 wherein the peroxydisulfate concentration is 0.5 percent.
Claim 3
Dependent Claim
36 words
The process of claim 2 wherein the pH of the treatment solution is adjusted to between 3 and 4 with a hydrogen peroxide inert acid after the polyester fiber is in contact with the treatment solution.
Claim 4
Dependent Claim
54 words
The process of claim 1 wherein the concentration of hydrogen peroxide values in the treatment solution and the ratio of treatment solution to polyester are sufficient to provide about 3.0 percent hydrogen peroxide values based upon the weight of polyester and wherein the ratio of hydrogen peroxide values to nitrogen compound is about 0.5:1.
Claim 5
Dependent Claim
36 words
The process of claim 5 wherein the pH of the treatment solution is adjusted to between 3 and 4 with a hydrogen peroxide inert acid after the polyester fiber is in contact with the treatment solution.
References Cited (Backward Citations)
US3360448A
Cited
US3418066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |