US3650819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable fire-retardant finish for cellulosic textile materials
Assignee: Wyeth Holdings LLC
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Filing: 1968-10-08
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Granted: 1972-03-21
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Expires: 1988-10-08
Abstract
Abstract WHEREIN R is alkyl, aryl, cyclo alkyl, R1 and R2 are hydrogen or lower alkyl; and R3 and R4 are alkyl, or, taken together with the nitrogen, represent a heterocyclic ring, followed by a curing step. A method for providing a hard water wash durable cyanamidephosphoric acid, flame-retardant finish for cellulosic textile materials which comprises aftertreating the textile material bearing the cyanamide-phosphoric acid finish with an aziridinyl phosphine oxide of the formula:
Inventors
- 👤 Robert George Weyker
- 👤 George Louis Mina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:58
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/487; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2965; Y10T428/2971; Y10T428/31504; Y10T428/31971; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672; Y10T442/268
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The method of claim 1 where the aziridinyl phosphine oxide is tris(1-aziridinyl)phosphine oxide.
Claim 2
Dependent Claim
16 words
The method of claim 1 wherein said aziridinyl phosphine oxide is employed as an aqueous solution.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said aziridinyl phosphine oxide is employed in an inert organic solvent.
Claim 4
Dependent Claim
18 words
The method of claim 1, including a water rinse prior to said impregnation with said aziridinyl phosphine oxide.
Claim 5
Dependent Claim
9 words
Cellulosic textile materials treated by the method of claim
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |