US3647749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antioxidant composition for organic materials
Assignee: Ethyl Corp
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Filing: 1969-09-26
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Granted: 1972-03-07
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Expires: 1989-09-26
Abstract
Abstract ORGANIC MATERIAL SUCH AS POLYPROPLENE IS STABILIZED BY ADDITION OF DIHYDROCARBYL-HYDROXYPHENOXY HYDROCARBYL SILANES HAVING THE FORMULA: -(R1)(4-N)-SI-(Z-(1-(HO-),2-R2-PHENYLENE)-R3)N WHEREIN R1 AND R2 ARE HYDROCARBON RADICALS, Z IS OXYGEN, SULFUR OR THE IMINO GROUP, AND R3 IS A HYDROCARBON RADICAL AN ALKOXY RADICAL OR A HALOGEN. A TYPICAL EXAMPLE IS DIPHENYL BIS(3,5 - DI-TERT-BUTYL-4-HYDROXYPHENOXY)SILANE. EFFECTIVENESS IS IMPROVED BY INCLUDING A DIHYDROCARBYLTHIODIALKANOATE SUCH AS DILAURYLTHIODIPROPIONATE, OR A PHOSPHONATE SUCH AS TRI-P-NONYLPHENYLPHOSPHITE.
Inventors
- 👤 Edward F Zaweski
- 👤 Bernard R Meltsner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C07F7/18; C07F7/1804; Y; Y10; Y10S; Y10S524/00; Y10S524/925
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |