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US3666543A
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Tris-(2-hydroxyalkyl)-phosphine oxide flame retardant articles
Assignee: Individual
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Filing: 1970-11-18
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Granted: 1972-05-30
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Expires: 1990-11-18
Abstract
Abstract TRIS-(2-HYDROXYALKYL)-PHOSPHINE OXIDES OF THE FORMULA (R-CH(-OH)-CH2)3-P(=O) IN WHICH R SIGNIFIES AN ALKYL GROUP HAVING 1 TO 6 CARBON ATOMS AND HAVING 0-6 HALOGEN SUBSTITUENTS ARE PROVIDED. A PROCESS FOR PREPARING THESE PHOSPHINE OXIDES AND THE USE THEREOF AS FLAMEPROOFING AGENTS ARE DISCLOSED.
Inventors
- 👤 Ludwig Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:02
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304; C07F9/54; C07F9/5407; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5397; C09; C09D; C09D5/00; C09D5/18; C09K; C09K21/00; C09K21/06; C09K21/12; B; B27; B27K; B27K2240/00; B27K2240/30; B27K3/00; B27K3/16; B27K3/166; B27K3/34; B27K3/38; B27K3/40; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672
Claims Analysis
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |