Patent US2640064A successfully refreshed from Google Patents.
US2640064A
Expired / Lapsed
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Bromoalkylsilanes and their preparation
Assignee: Dow Silicones Corp
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Filing: 1950-06-08
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Granted: 1953-05-26
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Expires: 1970-06-08
Abstract
No abstract record available.
Inventors
- 👤 Jr John L Speier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:04
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE METHOD WHICH COMPRISES CONTACTING CHLORINE AND BROMINE WITH A COMPOUND OF THE GENERAL FORMULA RA+1SICL3-A IN FLUID STATE, WHERE A HAS A VALUE OF FROM 2 TO 4 INCLUSIVE AND R IS SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL RADICALS, WHEREBY THERE IS PRODUCED A COMPOSITION OF THE GENERAL FORMULA RA(BRR'')SICL3-A WHERE A HAS A VALUE OF FROM 1 TO 3 INCLUSIVE, AND R'' IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF CH2 AND C2H4 RADICALS.
Claim 2
Independent Claim
80 words
THE METHOD WHICH COMPRISES CONTACTING CHLORINE AND BROMINE WITH A COMPOUND OF THE GENERAL FORMULA RA+1SICL3-A IN FLUID STATE, WHERE A HAS A VALUE OF FROM 2 TO 4 INCLUSIVE AND R IS SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL RADICALS, WHEREBY THERE IS PRODUCED A COMPOSITION OF THE GENERAL FORMULA RA(BRR'')SICL3-A WHERE A HAS A VALUE OF FROM 1 TO 3 INCLUSIVE, AND R'' IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF CH2 AND C2H4 RADICALS.
References Cited (Backward Citations)
US2572402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |