Patent US3644083A successfully refreshed from Google Patents.
US3644083A
Expired / Lapsed
US
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Durable flame retardant finish for cellulosic textile materials
Assignee: Wyeth Holdings LLC
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Filing: 1970-04-09
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Granted: 1972-02-22
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Expires: 1990-04-09
Abstract
Abstract Flame retardant finishes for cellulosic textile materials containing tetrakis(hydroxymethyl)phosphonium phosphate, tris(hydroxymethyl)phosphine, and at least one organic nitrogenous compound.
Inventors
- 👤 Richard Frederick Stockel
- 👤 William Frank Herbes
- 👤 Samuel James O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/43; D06M15/433; D06M15/667; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672; Y10T442/2689
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
The finish of claim 1 wherein the nitrogenous compound is selected from the group consisting of urea, melamine, a water-soluble methylol urea or a water-soluble methylol melamine.
Claim 2
Dependent Claim
17 words
The finish of claim 1 wherein the nitrogenous compound is a mixture of urea and methylolated melamine.
Claim 3
Dependent Claim
31 words
The finish of claim 1 where of the total phosphorus-containing compounds between about 0.15 and 0.60 mole percent is tetrakis(hydroxymethyl)phosphonium phosphate and between about 0.85 and 0.40 mole percent is tris(hydroxymethyl)phosphine.
Claim 4
Dependent Claim
30 words
The finish of claim 1 where the ratio of nitrogen in the nitrogenous compound to the phosphine-derived phosphorus is between about 15/1 and 3/10 on a parts by weight basis.
Claim 5
Dependent Claim
25 words
A process of treating cellulosic textile materials to render them flame retardant which comprises applying to said textile the flame retardant finish of claim 1.
Claim 6
Dependent Claim
10 words
A textile material obtained by the process of claim 6.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |