US3661841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymers
Assignee: Hooker Chemical Corp
•
Filing: 1970-04-20
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Granted: 1972-05-09
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Expires: 1990-04-20
Abstract
Abstract COMPOUNDS ARE DESCRIBED OF THE STRUCTURE 1,2-(-O-P(-X)-S-),(R'')N''-BENZENE WHEREIN R'' IS SELECTED FROM THE GROUP CONSISTING OF ALKYL OF 1 TO 18 CARBON ATOMS, ARYL OF 6 TO 12 CARBON ATOMS AND CYCLOHEXYL; X IS A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE, BROMINE AND IODINE; AND N'' RANGES FROM 0 TO 4. THE COMPOUNDS ARE PREPARED BY REACTING AN ORTHOMERCAPTOPHENOL COMPOUND WITH PHOSPHORUS TRIHALIDE. THE RESULTING COMPOUNDS CAN BE USED TO IMPART FIRE RETARDANCY TO PLASTIC COMPOSITIONS, IN PARTICULAR POLYSTYRENE.
Inventors
- 👤 James L Dever
- 👤 James J Hodan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5398; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6578
Claims Analysis
Total Claims: 0
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |