US3755397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silylating agent
Assignee: Dow Silicones Corp
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Filing: 1971-06-01
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Granted: 1973-08-28
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Expires: 1991-06-01
Abstract
Abstract SILAZANES OF THE FORMULA (RCH3SINH)X AND CHLOROSILANES OF THE FORMULA R(CH3)SICL2 ARE MIXED AT A TEMPERATURE OF BELOW 50*C. IN THE ABSENCE OF A CATALYST SUCH AS LEWIS ACID, TO FORM CHLOROSILAZANES IN WHICH THE MAJOR PRODUCT IS OF THE FORMULA CL-(SI(-R)(-CH3)-NH)N-SI(-R)(-CH3)-CL THE PRODUCT IS ESPECIALLY SUITABLE FOR SILYLATING ORGANIC COMPOUNDS SUCH AS DRUGS CONTAINING ONE OR MORE FUNCTIONAL GROUPS OF THE TYPE XH, WHERE X IS OXYGEN, SULFUR OR NITROGEN.
Inventors
- 👤 C Roth
- 👤 J Speier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:38
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/126
Claims Analysis
Total Claims: 0
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |