US2759008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure polymerization of alkylcyclosiloxanes in the presence of an acid catalyst
Assignee: Union Carbide Corp
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Filing: 1953-06-10
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Granted: 1956-08-14
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Expires: 1973-06-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Milton L Dunham
- 👤 George H Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:56
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR PREPARING AN ALKYLSILOXANE POLYMER WHICH COMPRISES TREATING AN ALKYLCYCLOSILOXANE, HAVING THE FORMULA (RR''SIO)X WHERE R IS AN ALKYL RADICAL, R'' IS TAKEN FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL RADICAL AND X IS AN INTEGER OF FROM 3 TO 8, WITH AN ACID CATALYST UNDER A PRESSURE OF AT LEAST 1500 POUNDS PER SQUARE INCH AND RECOVERING AN ALKYLSILOXANE POLYMER.
Claim 2
Dependent Claim
65 words
A PROCESS FOR PREPARING AN ALKYLSILOXANE POLYMER WHICH COMPRISES TREATING AN ALKYLCYCLOSILOXANE, HAVING THE FORMULA (RR''SIO)X WHERE R IS AN ALKYL RADICAL, R'' IS TAKEN FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL RADICAL AND X IS AN INTEGER OF FROM 3 TO 8, WITH AN ACID CATALYST UNDER A PRESSURE OF AT LEAST 1500 POUNDS PER SQUARE INCH AND RECOVERING AN ALKYLSILOXANE POLYMER.
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) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |