US3175995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of organopolysiloxanes by siloxane rearrangement
Assignee: General Electric Co
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Filing: 1962-04-06
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Granted: 1965-03-30
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Expires: 1982-04-06
Abstract
No abstract record available.
Inventors
- 👤 John R Elliott
- 👤 Glenn D Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE PROCESS FOR CAUSING SILOXANE REARRANGEMENT WHICH COMPRISES CONTACTING AN ORGANOPOLYSILOXANE HAVING THE FORMULA RA-SI-O((4-A)/2) WITH AN ALKALINE ARRANGEMENT AND CONDENSATION CATALYST SELECTED FROM THE CLASS CONSISTING OF ALKALI-METALHYDROXIDES, ALKALI-METAL SILANOLATES, QUATERNARY AMMONIUM COMPOUNDS, AND QUATERNARY PHOSPHONIUM COMPOUNDS OF THE FORMULA (R'')4POR", IN THE PRESENCE OF AT LEAST 0.005 PERCENT, BY WEIGHT, BASED ON THE WEIGHT OF THE ORGANOPOLYSILOXANE, OF AN ORGANOSULFUR COMPOUND OF THE CLASS CONSISTING OF ALKYL SULFOXIDES AND ALKYL SULFONES CONTAINING AT MOST 4 CARBON ATOMS, WHERE R AND R'' ARE MEMBERS SELECTED FROM THE CLASS OF RADICALS CONSISTING OF ALKYL, ALKENYL, ARYL, SRSLKYL, SLKSRYL, HDLOGENATED ARYL, CYANOALKYL RADICALS, AND MIXTURES OF SUCH RADICALS, AND R" IS A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND ALKYL RADICALS, AND A HAS AN AVERAGE VALUE OF FROM ABOUT 1.2 TO LESS THAN 3.
Claim 2
Dependent Claim
136 words
THE PROCESS FOR CAUSING SILOXANE REARRANGEMENT WHICH COMPRISES CONTACTING AN ORGANOPOLYSILOXANE HAVING THE FORMULA RA-SI-O((4-A)/2) WITH AN ALKALINE ARRANGEMENT AND CONDENSATION CATALYST SELECTED FROM THE CLASS CONSISTING OF ALKALI-METALHYDROXIDES, ALKALI-METAL SILANOLATES, QUATERNARY AMMONIUM COMPOUNDS, AND QUATERNARY PHOSPHONIUM COMPOUNDS OF THE FORMULA (R'')4POR", IN THE PRESENCE OF AT LEAST 0.005 PERCENT, BY WEIGHT, BASED ON THE WEIGHT OF THE ORGANOPOLYSILOXANE, OF AN ORGANOSULFUR COMPOUND OF THE CLASS CONSISTING OF ALKYL SULFOXIDES AND ALKYL SULFONES CONTAINING AT MOST 4 CARBON ATOMS, WHERE R AND R'' ARE MEMBERS SELECTED FROM THE CLASS OF RADICALS CONSISTING OF ALKYL, ALKENYL, ARYL, SRSLKYL, SLKSRYL, HDLOGENATED ARYL, CYANOALKYL RADICALS, AND MIXTURES OF SUCH RADICALS, AND R" IS A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND ALKYL RADICALS, AND A HAS AN AVERAGE VALUE OF FROM ABOUT 1.2 TO LESS THAN 3.
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |