US2496067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biphenyl derivatives and method of preparing them
Assignee: RCA Corp
•
Filing: 1945-11-30
•
Granted: 1950-01-31
•
Expires: 1965-11-30
Abstract
No abstract record available.
Inventors
- 👤 Rosenthal Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:10
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/24; C07C17/00; C07C17/35
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE METHOD OF PREPARING 2,5,2''5''-TETRAHALOGENO-4,4''-DIVINYL-BIPHENYL COMPRISING REACTING 2,5,2''5''-TETRAHALOGENO-BIPHENYL WITH ACETYL CHLORIDE IN THE PRESENCE OF ALUMINUM CHLORIDE TO FORM 2,5,2''5''-TETRAHALOGENO-4''4''-DIACETYL-BIPHENYL, REACTING SAID 2,5,2''5''-TETRAHALOGENO-4,4''-DIACETYLBIPHENYL WITH ALUMINUM ISOPROPOXIDE TO FORM 2,5,2''5''-TETRAHALOGENO-4,4''-DI-(B-HYDROXYETHYL)BIPHENYL, AND REACTING AND 2,5,2''5''-TETRAHALOGENO-4,4''-DI-(B-HYDROXYETHYL)-BIPHENYL IN THE
Claim 2
Independent Claim
35 words
THE METHOD OF PREPARING 2,5,2''5''-TETRAHALOGENO-4,4''-DIVINYL-BIPHENYL COMPRISING REACTING 2,5,2''5''-TETRAHALOGENO-BIPHENYL WITH ACETYL CHLORIDE IN THE PRESENCE OF ALUMINUM CHLORIDE TO FORM 2,5,2''5''-TETRAHALOGENO-4''4''-DIACETYL-BIPHENYL, REACTING SAID 2,5,2''5''-TETRAHALOGENO-4,4''-DIACETYLBIPHENYL WITH ALUMINUM ISOPROPOXIDE TO FORM 2,5,2''5''-TETRAHALOGENO-4,4''-DI-(B-HYDROXYETHYL)BIPHENYL, AND REACTING AND 2,5,2''5''-TETRAHALOGENO-4,4''-DI-(B-HYDROXYETHYL)-BIPHENYL IN THE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |