US2744923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of organopolysiloxanes
Assignee: Union Carbide Corp
•
Filing: 1951-06-22
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Granted: 1956-05-08
•
Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 John J Duane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:06
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN THE MAKING OF ORGANOPOLYSILOXANES BY HYDROLYSIS OF A HYDROLYZABLE ORGANOSILANE TAKEN FROM THE GROUP CONSISTING OF HYDROCARBON AND HYDROCARBONOXYSILANES WITH SYBSEQUENT CONDENSATION, THE IMPROVEMENT WHICH COMPRISES CONDENSING THE INTERMEDIATE HYDROLYSIS PRODUCT IN CONTACT WITH A SUBSTANTIALLY ANHYDROUS POTASSIUM SALT OF A WEAK INORGANIC ACID, WHILE PROVIDING FOR REMOVAL OF WATER OF CONDENSATION FROM THE REACTION ZONE.
Claim 2
Dependent Claim
57 words
IN THE MAKING OF ORGANOPOLYSILOXANES BY HYDROLYSIS OF A HYDROLYZABLE ORGANOSILANE TAKEN FROM THE GROUP CONSISTING OF HYDROCARBON AND HYDROCARBONOXYSILANES WITH SYBSEQUENT CONDENSATION, THE IMPROVEMENT WHICH COMPRISES CONDENSING THE INTERMEDIATE HYDROLYSIS PRODUCT IN CONTACT WITH A SUBSTANTIALLY ANHYDROUS POTASSIUM SALT OF A WEAK INORGANIC ACID, WHILE PROVIDING FOR REMOVAL OF WATER OF CONDENSATION FROM THE REACTION ZONE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |