Patent US3470447A successfully refreshed from Google Patents.
Patent US3772247A successfully refreshed from Google Patents.
US3772247A
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US
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Siloxanes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-09-08
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Granted: 1973-11-13
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Expires: 1992-09-08
Abstract
Abstract ORGANOPOLYSILOXANE RESINS ARE PROVIDED WHICH CONSIST OF THE UNITS R3SIO1/2 AND SIO2 WITH UNITS OF THE TYPE RHSIO AND/OR HSIO3/2 WHERE R IS A MONOVALENT HYDROCARBON GROUP, SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ARALKYL, ALKARYL, ALKENYL, CYCLOALKYL OR CYCLOALKENYL GROUPS, THE RATIO OF R3SIO1/2 UNITS AND RHSIO AND/OR HSIO3/2 UNITS TO SIO2 UNITS BEING FROM 0.6:1 TO 1.5:1 AND THE RATIO OF R3SIO1/2 UNITS TO RHSIO AND/OR HSIO3/2 UNITS BEING FROM 1:1 TO 50:1. ADDITONALLY, IF DESIRABLE, THE SILICON-BONDED HYDROXYL CONTENT IS NOT GREATER THAN 1.0 PERCENT WEIGHT.
Inventors
- 👤 W Flannigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59; C; C08; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |