US3888779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant composition containing tetrakis (hydroxymethyl) phosphonium oxalate
Assignee: Wyeth Holdings LLC
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Filing: 1972-12-26
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Granted: 1975-06-10
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Expires: 1992-12-26
Abstract
Abstract Durable flame retardancy and a soft hand are imparted to cellulosic textile materials by applying and curing an aqueous solution of tetrakis(hydroxymethyl)phosphonium oxalate and urea, a melamine, or a methylolated nitrogenous cellulose reactant or mixtures thereof to the textile materials.
Inventors
- 👤 Tsai Hsiang Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:42
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/43; D06M15/431; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
AN AQUEOUS FLAME RETARDANT FINISH COMPOSITION SOLUTION FOR CELLULOSE TEXTILE MATERIALS COMPRISING: TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM OXALATE AND AT LEAST ONE ORGANIC NITROGENOUS COMPOUND HAVING A TRIVALENT NITROGEN BEARING AT LAST 2 MEMBERS COMPRISED OF HYDROGEN ATOMS AND METHYLOL GROUPS, OR MIXTURES THEREOF WHEREIN THE RATIO OF NITROGEN OF THE NITROGENOUS COMPOUNDS TO PHOSPHINE-DERIVED PHOSPHOROUS ON A PARTS BY WEIGHT BASIS IS BETWEEN 0.5 AND 5.0.
Claim 2
Dependent Claim
64 words
AN AQUEOUS FLAME RETARDANT FINISH COMPOSITION SOLUTION FOR CELLULOSE TEXTILE MATERIALS COMPRISING: TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM OXALATE AND AT LEAST ONE ORGANIC NITROGENOUS COMPOUND HAVING A TRIVALENT NITROGEN BEARING AT LAST 2 MEMBERS COMPRISED OF HYDROGEN ATOMS AND METHYLOL GROUPS, OR MIXTURES THEREOF WHEREIN THE RATIO OF NITROGEN OF THE NITROGENOUS COMPOUNDS TO PHOSPHINE-DERIVED PHOSPHOROUS ON A PARTS BY WEIGHT BASIS IS BETWEEN 0.5 AND 5.0.
Claim 3
Dependent Claim
12 words
A finish composition according to claim 1 of tetrakis(hydroxymethyl)phosphonium oxalate and urea.
Claim 4
Dependent Claim
29 words
A finish composition according to claim 2 wherein the ratio of the nitrogen of urea to phosphine-derived phosphorus on a parts by weight basis is between 0.7 and 2.0.
Claim 5
Dependent Claim
27 words
A finish composition according to claim 2 comprising 0.3 to 1.0 mole of tetrakis(hydroxymethyl)phosphonium oxalate and from 0.5 to 2 moles of urea per liter of solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |