Patent US3833674A successfully refreshed from Google Patents.
US3833674A
Expired / Lapsed
US
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Recovery of brominated biphenyl
Assignee: Ethyl Corp
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Filing: 1972-08-24
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Granted: 1974-09-03
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Expires: 1992-08-24
Abstract
Abstract A PROCESS FOR PREPARING POLYBROMINATED AROMATIC COMPOUNDS WHICH COMPRISES (A) REACTING AN AROMATIC COMPOUND WITH BROMINE IN THE PRESENCE OF A METAL HALIDE HALOGENATION CATALYST AND SOLVENT QUANTITIES OF METHYLENE BROMIDE, AND (B) ADDING A LOWER ALKANOL TO THE THEREBY PRODUCED REACTION MIXTURE TO PRECIPITATE POLYBROMINATED AROMATIC PRODUCT.
Inventors
- 👤 D Brackenridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:58
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/18; B; B01; B01J; B01J37/00; B01J37/22; C07C17/00; C07C17/093; C07C17/10; C07C17/12
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |