US3941850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
α,α,α',α'-TETRAKIS(4-HYDROXY-3,5-DISUBSTITUTED PHENYL)XYLENE
Assignee: Qo Chemicals Inc
•
Filing: 1974-03-15
•
Granted: 1976-03-02
•
Expires: 1994-03-15
Abstract
Abstract A new series of compounds defined broadly as α,α,α',α'-tetrakis(4-hydroxy-3,5-disubstituted phenyl)-xylenes, which are useful as antioxidants for organic materials normally subject to oxidative deterioration, is disclosed.
Inventors
- 👤 Gordon D. Brindell
- 👤 Joseph P. Wuskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; C07C39/00; C07C39/12; C07C39/15; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
α, α, α', α',-tetrakis (4-hydroxy-3,5-dibenzylphenyl) p-xylene.
Claim 2
Dependent Claim
6 words
α, α, α', α',-tetrakis (4-hydroxy-3,5-dibenzylphenyl) p-xylene.
Claim 3
Dependent Claim
6 words
α, α, α', α'-tetrakis [4-hydroxy-3,5-di(p-methylbenzyl)phenyl] p-xylene.
Claim 4
Dependent Claim
6 words
α, α, α', α'-tetrakis [4-hydroxy-3,5-di(p-methylbenzyl)phenyl] p-xylene.
References Cited (Backward Citations)
US3026297A
Cited
US3350347A
Cited
US3689572A
Cited
US3309337A
Cited
US3393244A
Cited
US3642669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |