Patent US2816124A successfully refreshed from Google Patents.
US2816124A
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Process for preparing hexaethylcyclotrisiloxane
Assignee: Union Carbide Corp
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Filing: 1954-04-21
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Granted: 1957-12-10
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Expires: 1974-04-21
Abstract
No abstract record available.
Inventors
- 👤 Edward R York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:20
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874; C07F7/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
AN IMPROVED PROCESS FOR PREPARING HEXAETHYLCYCLOTRISILOXANE WHICH COMPRISES HEATING OCTTAETHYCYLOTETRASILOXANE IN THE PRESENCE OF AN ALKALINE-POTASSIUM CATALYST TO A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 250*C. AND DISTILLING HEXAETHYLCYCLOTRISILOXANE UNDER A REDUCED PRESSURE.
Claim 2
Dependent Claim
34 words
AN IMPROVED PROCESS FOR PREPARING HEXAETHYLCYCLOTRISILOXANE WHICH COMPRISES HEATING OCTTAETHYCYLOTETRASILOXANE IN THE PRESENCE OF AN ALKALINE-POTASSIUM CATALYST TO A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 250*C. AND DISTILLING HEXAETHYLCYCLOTRISILOXANE UNDER A REDUCED PRESSURE.
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) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |