US2774779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing phenylhalosilanes
Assignee: Dow Silicones Corp
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Filing: 1953-05-27
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Granted: 1956-12-18
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Expires: 1973-05-27
Abstract
No abstract record available.
Inventors
- 👤 John W Gilkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/127; B; B01; B01J; B01J27/00; B01J27/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS OF PREPARING MONOMERIC PHENYLSILANES WHICH COMPRISES HEATING A SILCARBANE IN WHICH THE SILICON ATOMS ARE CONNECTED BY PHENYLENE LINKS, THE REMAINING VALENCES OF THE SILICON BEING SATISFIED BY A RADICAL SELECTED FROM THE GROUP CONSISTING OF HALOGEN ATOMS AND MONOVALENT HYDROCARBON RADICALS, WITH BENZENE IN THE PRESENCE OF A CATALYST OF THE GROUP CONSISTING OF BORON AND ALUMINUM HALIDES, AT A TEMPERATURE OF FROM 150 TO 450* C., IN A CLOSED SYSTEM.
Claim 2
Dependent Claim
74 words
A PROCESS OF PREPARING MONOMERIC PHENYLSILANES WHICH COMPRISES HEATING A SILCARBANE IN WHICH THE SILICON ATOMS ARE CONNECTED BY PHENYLENE LINKS, THE REMAINING VALENCES OF THE SILICON BEING SATISFIED BY A RADICAL SELECTED FROM THE GROUP CONSISTING OF HALOGEN ATOMS AND MONOVALENT HYDROCARBON RADICALS, WITH BENZENE IN THE PRESENCE OF A CATALYST OF THE GROUP CONSISTING OF BORON AND ALUMINUM HALIDES, AT A TEMPERATURE OF FROM 150 TO 450* C., IN A CLOSED SYSTEM.
References Cited (Backward Citations)
US2577782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |