Patent US3929908A successfully refreshed from Google Patents.
US3929908A
Expired / Lapsed
US
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Brominated biphenols
Assignee: General Electric Co
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Filing: 1971-08-05
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Granted: 1975-12-30
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Expires: 1991-08-05
Abstract
Abstract Bromobiphenols containing at least two bromine atoms meta to the phenolic hydroxyl groups can be produced from 3,3'' ,5,5''-tetrasubstituted diphenoquinones by reacting the latter with bromine. The reaction can be controlled to produce little, if any, byproduct. The products obtained are dependent to some extent on the substituents in the four positions ortho to the hydroxyl groups. The biphenols can be used as antioxidants or as starting materials for preparation of flame-retardant polymeric compositions useful in the molding, coating and insulating arts.
Inventors
- 👤 Charles M Orlando
- 👤 Francois A Lavallee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:46
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/30; C07; C07C; C07C37/00; C07C37/62; C07C39/00; C07C39/24; C07C39/367; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/20; C10L1/203; C08L; C08L2201/00; C08L2201/02; C08L69/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
6 words
A CHEMICAL COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
A CHEMICAL COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
16 words
The compound of claim 1, where each R1, R2, R3 and R4 is a methyl radical.
Claim 4
Dependent Claim
16 words
The compound of claim 1, where each R1, R2, R3 and R4 is an ethyl radical.
Claim 5
Dependent Claim
23 words
The compound of claim 1, where each R1 and R2 is a methyl radical and each R3 and R4 is an ethyl radical.
Claim 6
Dependent Claim
23 words
The compound of claim 1, where each R1 and R3 is a methyl radical and each R2 and R4 is an ethyl radical.
Claim 7
Dependent Claim
21 words
The compound of claim 1, where each R1, R2 and R3 is a methyl radical and R4 is an ethyl radical.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |