Patent US2813887A successfully refreshed from Google Patents.
US2813887A
Expired / Lapsed
US
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Preparation of arylhalosilanes
Assignee: Primerica Inc
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Filing: 1953-11-20
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Granted: 1957-11-19
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Hugh E Ramsden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:40
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
THE PROCESS OF PREPARING AN ARYLHALOSILANE, WHICH COMPRISES REACTING AN ARYLMAGNESIUM HALIDE WITH A SILICON HALIDE IN THE PRESENCE OF CATALYTIC AMOUNTS OF A COBALT SALT.
Claim 2
Dependent Claim
26 words
THE PROCESS OF PREPARING AN ARYLHALOSILANE, WHICH COMPRISES REACTING AN ARYLMAGNESIUM HALIDE WITH A SILICON HALIDE IN THE PRESENCE OF CATALYTIC AMOUNTS OF A COBALT SALT.
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |