US3650979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methyl-polysiloxane-containing defoaming agents and preparation thereof
Assignee: Bayer AG
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Filing: 1968-05-16
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Granted: 1972-03-21
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Expires: 1988-05-16
Abstract
Abstract A STABLE DEFOAMING AGENT WHICH IS VERY EFFECTIVE IN AQEOUS SYSTEMS IS PREPARED ACCORDING TO THE INVENTION BY EMULSIFYING, IN 100 TO 10,000 PARTS BY WEIGHT OF WATER, 100 PARTS BY WEIGHT OF AN A,W-BIS-(TRIMETHYLSILOXY)-POLYDIMETHYL-SILOXANE HAVING A VISCOSITY BETWEEN 500 AND 5000 CENTISTOKES AT 20*C., 1 TO 15 PARTS BY WEIGHT OF FINELY DIVIDED SILICA AND 20 TO 40 PARTS BY WEIGHT OF AN EMULSIFIER CONSISTING OF A POLYGLYCOL ETHER OR A FATTY ACID ESTER THEREOF OR OF AN ALKYL- OR ARYL-SULPHATE OR -SULPHO NATE, AND ADMIXING THE EMULSION SO OBTAINED WITH 100 TO 500 PARTS BY WEIGHT OF A FATTY ACID ESTER OF HYDROXYETHANE-SULPHONIC ACID OR AN ALKALI METAL SALT THEREOF.
Inventors
- 👤 Hans-Horst Steinbach
- 👤 Werner Theuer
- 👤 Karl Schnurrbusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 0
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |