US3740187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for bleaching textiles
Assignee: Monsanto Co
•
Filing: 1971-06-03
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Granted: 1973-06-19
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Expires: 1991-06-03
Abstract
Abstract Textile fibers which have been de-sized and scoured are bleached with an alkaline aqueous solution containing a peroxy compound and an alkali metal silicate and a ''''stabilizer'''' for (1) reducing the decomposition of said peroxy compound and (2) preventing silicate deposition, and which is, for example, a combination of nitrilotriacetic acid, 1-hydroxy ethylidene-1,1diphosphonic acid, and a magnesium or calcium salt, e.g., magnesium sulfate.
Inventors
- 👤 X Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:19
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3937; C11D3/394; D; D06; D06L; D06L4/00; D06L4/10; D06L4/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
The process as set forth in claim 1 wherein the concentration of the stabilizing agent is from about 0.1 to about 1.0 percent by weight.
Claim 2
Dependent Claim
28 words
The process as set forth in claim 2 wherein the temperature of the bleaching bath during the textile treatment is from about 140* F to about 210* F.
Claim 3
Dependent Claim
23 words
The process as set forth in claim 3 wherein the peroxy compound is hydrogen peroxide and the alkali metal silicate is sodium silicate.
Claim 4
Dependent Claim
29 words
The process as set forth in claim 4 wherein the stabilizing agent is a combination of (a) 1-hydroxy ethylidene-1,1-diphosphonic acid, (b) a water-soluble magnesium salt, and (c) nitrilotriacetic acid.
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |