US2557931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylene linked organopolysilanes
Assignee: Dow Silicones Corp
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Filing: 1950-02-03
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Granted: 1951-06-26
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Expires: 1970-02-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:56
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
87 words
THE PROCESS WHICH COMPRISES REACTING AN ORGANOCHLOROSILANE OF THE GENERAL FORMULA C6H5RXSICL3-X, IN WHICH EACH R REPRESENTS A MONOVALENT HYDROCARBON RADICAL FREE OF ALIPHATIC UNSATURATION AND X IS AN INTEGER HAVING A VALUE OF FROM 0 TO 2 INCLUSIVE, WITH A CHLOROHYDROSILANE OF THE GROUP CONSISTING OF METHYLDICHLOROSILANE AND TRICHLOROSILANE, IN THE PRESENCE OF A BORON HALIDE AND AT A TEMPERATURE OF FROM 150* C. TO 420* C., AT LEAST A PORTION OF THE REACTION MIXTURE BEING IN A LIQUID PHASE, WHEREBY PHENYLENE LINKED CHLOROSILANES ARE PRODUCED.
Claim 2
Dependent Claim
87 words
THE PROCESS WHICH COMPRISES REACTING AN ORGANOCHLOROSILANE OF THE GENERAL FORMULA C6H5RXSICL3-X, IN WHICH EACH R REPRESENTS A MONOVALENT HYDROCARBON RADICAL FREE OF ALIPHATIC UNSATURATION AND X IS AN INTEGER HAVING A VALUE OF FROM 0 TO 2 INCLUSIVE, WITH A CHLOROHYDROSILANE OF THE GROUP CONSISTING OF METHYLDICHLOROSILANE AND TRICHLOROSILANE, IN THE PRESENCE OF A BORON HALIDE AND AT A TEMPERATURE OF FROM 150* C. TO 420* C., AT LEAST A PORTION OF THE REACTION MIXTURE BEING IN A LIQUID PHASE, WHEREBY PHENYLENE LINKED CHLOROSILANES ARE PRODUCED.
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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |