UST970006I4
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of halophenols
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1977-07-01
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Granted: 1978-05-02
•
Expires: 1997-07-01
Abstract
Abstract halophenols of formula ##STR1## where X = halogen, are made by condensation of a compound ##STR2## where Z is OH or halogen with a phenol in the presence of anhydrous HF as a catalyst. The compound ##STR3## where X = F, may be made in situ by the reaction of ##STR4## with an alkali metal nitrite in anhydrous HF.
Inventors
- 👤 John Brewster Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:37
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/82; C07C49/83; C07C45/00; C07C45/45; C07C45/46; C07C45/78; C07C45/79; C07C45/81
Claims Analysis
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |