US3845090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of organosiloxane-oxyalkylene-blockcopolymers
Assignee: Wacker Chemie AG
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Filing: 1973-05-31
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Granted: 1974-10-29
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Expires: 1993-05-31
Abstract
Abstract 1. A PROCESS FOR THE PRODUCTION OF ORGNOSILIXANEOXYALKYLENE-BLOCKCOPOLYMERS IN WHICH THE POLYOXYALKYLENE BLOCKS ARE LINKED TO THE ORGANOPOLYSILOXANE BLOCKS BY SI-O-C-BONDS, WHICH COMPRISES REACTING AN ORGANOPOLYSULOXANE CONTANING SI-BONDED HYDROGEN ATOMS WITH POLYOXYALKYLENE COMPOUNDS HAVING AT LEAST ONE ALCOHOLIC HYDROXYL GRUP IN THE PRESENCE OF AKALI SUBSTANCES WHICH ARE INSOLUBLE UNDER THE REACTION CONDITIONS AND HAVE A SURFACE AREA OF AT LEAST 20 M.2/G., SAID ALKALI SUBSTANCES ARE SELECTED FROM THE GROUP CONSISTING OF ALKALI REACTING CLAYS, ALKALI REACTING EARTHS AND ALKALI REACTING ACTIVATE CHARCOALS.
Inventors
- 👤 S Nitzsche
- 👤 P Huber
- 👤 E Pirson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:39
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR THE PRODUCTION OF ORGNOSILIXANEOXYALKYLENE-BLOCKCOPOLYMERS IN WHICH THE POLYOXYALKYLENE BLOCKS ARE LINKED TO THE ORGANOPOLYSILOXANE BLOCKS BY SI-O-C-BONDS, WHICH COMPRISES REACTING AN ORGANOPOLYSULOXANE CONTANING SI-BONDED HYDROGEN ATOMS WITH POLYOXYALKYLENE COMPOUNDS HAVING AT LEAST ONE ALCOHOLIC HYDROXYL GRUP IN THE PRESENCE OF AKALI SUBSTANCES WHICH ARE INSOLUBLE UNDER THE REACTION CONDITIONS AND HAVE A SURFACE AREA OF AT LEAST 20 M.2/G., SAID ALKALI SUBSTANCES ARE SELECTED FROM THE GROUP CONSISTING OF ALKALI REACTING CLAYS, ALKALI REACTING EARTHS AND ALKALI REACTING ACTIVATE CHARCOALS.
Claim 2
Dependent Claim
83 words
A PROCESS FOR THE PRODUCTION OF ORGNOSILIXANEOXYALKYLENE-BLOCKCOPOLYMERS IN WHICH THE POLYOXYALKYLENE BLOCKS ARE LINKED TO THE ORGANOPOLYSILOXANE BLOCKS BY SI-O-C-BONDS, WHICH COMPRISES REACTING AN ORGANOPOLYSULOXANE CONTANING SI-BONDED HYDROGEN ATOMS WITH POLYOXYALKYLENE COMPOUNDS HAVING AT LEAST ONE ALCOHOLIC HYDROXYL GRUP IN THE PRESENCE OF AKALI SUBSTANCES WHICH ARE INSOLUBLE UNDER THE REACTION CONDITIONS AND HAVE A SURFACE AREA OF AT LEAST 20 M.2/G., SAID ALKALI SUBSTANCES ARE SELECTED FROM THE GROUP CONSISTING OF ALKALI REACTING CLAYS, ALKALI REACTING EARTHS AND ALKALI REACTING ACTIVATE CHARCOALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |