Patent US2741630A successfully refreshed from Google Patents.
US2741630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing alkylpolysiloxanes
Assignee: General Electric Co
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Filing: 1955-03-17
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Granted: 1956-04-10
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Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Charles E Reed
- 👤 John M Tome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:31
CPC Classifications
C; C08; C08G; C08G77/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS FOR MAKING ALKYLPOLYSILOXANES WHICH COMPRISES SIMULTANEOUSLY PASSING A DIALKYLDIHALOGENOSILANE AND AN ALKANOL, BOTH IN THE VAPOR PHASE, OVER A CASTALYST BED COMPOSED OF A ZINC HALIDE AND SILICA GEL WHILE MAINTAINING THE TEMPERATURE OF THE REACTION ABOVE 175* AND BELOW THE DECOMPOSITION POINT OF THE REACTANTS AND THE REACTION PRODUCTS.
Claim 2
Dependent Claim
52 words
THE PROCESS FOR MAKING ALKYLPOLYSILOXANES WHICH COMPRISES SIMULTANEOUSLY PASSING A DIALKYLDIHALOGENOSILANE AND AN ALKANOL, BOTH IN THE VAPOR PHASE, OVER A CASTALYST BED COMPOSED OF A ZINC HALIDE AND SILICA GEL WHILE MAINTAINING THE TEMPERATURE OF THE REACTION ABOVE 175* AND BELOW THE DECOMPOSITION POINT OF THE REACTANTS AND THE REACTION PRODUCTS.
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) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |