US2845435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrryl silicon compounds and their preparation
Assignee: EF Houghton and Co
•
Filing: 1955-10-11
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Granted: 1958-07-29
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Expires: 1975-10-11
Abstract
No abstract record available.
Inventors
- 👤 Kurt C Frisch
- 👤 Roland M Kary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:00
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/0803; C07F7/081; C07F7/0812; C07F7/0814; C07F7/0834; C07F7/0838
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
A 2-PYRRL SILICON COMPOUND HAVING THE STRUCTURE
Claim 2
Dependent Claim
7 words
A 2-PYRRL SILICON COMPOUND HAVING THE STRUCTURE
Claim 3
Independent Claim
70 words
A METHOD OF PREPARING A 2-PYRRL SILICON COMPOUND WHICH COMPRISES REACTING AN ANHYDROUS MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN N-PYRRLMAGNESIUM BROMIDE AND N-LITHIUM PYRROLE WITH AN ANHYDROUS METHYLPOLYCHLOROSILANE IN AN ANHYDROUS INERT MEDIUM UNDER REFLUX CONDITIONS AND TEMPERATURES, SEPARTING A 2-PYRRLMETHYLCHLOROSILANE FROM SAID INERT MEDIUM, HYDROLYZING AND POLYMERIZING SAID PYRRLCHLOROSILANE IN THE PRESENCE OF WATER, AND SEPARATING THE POLYMERIZED PRODUCT FROM SAID WATER TO FORM THEREFROM A SILOXANE.
Claim 4
Independent Claim
70 words
A METHOD OF PREPARING A 2-PYRRL SILICON COMPOUND WHICH COMPRISES REACTING AN ANHYDROUS MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN N-PYRRLMAGNESIUM BROMIDE AND N-LITHIUM PYRROLE WITH AN ANHYDROUS METHYLPOLYCHLOROSILANE IN AN ANHYDROUS INERT MEDIUM UNDER REFLUX CONDITIONS AND TEMPERATURES, SEPARTING A 2-PYRRLMETHYLCHLOROSILANE FROM SAID INERT MEDIUM, HYDROLYZING AND POLYMERIZING SAID PYRRLCHLOROSILANE IN THE PRESENCE OF WATER, AND SEPARATING THE POLYMERIZED PRODUCT FROM SAID WATER TO FORM THEREFROM A SILOXANE.
References Cited (Backward Citations)
US2640818A
Cited
US2640833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |