US3383327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam control agents
Assignee: Dow Silicones Corp
•
Filing: 1963-05-06
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Granted: 1968-05-14
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Robert E Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:18
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A FOAM CONTROL AGENT HAVING A VISCOSITY FROM 50 TO 500,000 CS. AT 25*C. PREPARED BY HEATING A MIXTURE OF (1) 96 PERCENT BY WEIGHT OF AN ESSENTIALLY POLYDIORGANOSILOXANE WHEREIN THE ORGANO GROUPS ARE SELECTED FROM THE GROUP CONSISTING OF THE METHYL, ETHYL AND 2-PEHNYLPROPYL GROUPS, SAID FLUID HAVING A METHYL TO SILICON RATIO OF ABOUT 1:1, AN ETHYL TO SILICON RATIO IN THE RANGE OF .7 TO 9:1 AND A 2-PEHNYLPROPYL TO SILICON RATIO IN THE RANGE OF .1 TO 3:1, (2) ABOUT 3 PERCENT BY WEIGHT OF SILICA HAVING A SURFACE AREA OF ABOUT 225 SQUARE METERS PER GRAM, AND (3) ABOUT 1 PERCENT BY WEIGHT OF A HYDROXYLATED POLYDIMETHYLSILOXANE FLUID, AT A TEMPERATURE OF AT LEAST 100*C. WHILE THE MIXTURE IS BEING SUBJECTED TO A SHEARING ACTION WHEREBY A FOAM CONTROL AGENT HAVING IMPROVED STABILITY IS OBTAINED.
Claim 2
Dependent Claim
140 words
A FOAM CONTROL AGENT HAVING A VISCOSITY FROM 50 TO 500,000 CS. AT 25*C. PREPARED BY HEATING A MIXTURE OF (1) 96 PERCENT BY WEIGHT OF AN ESSENTIALLY POLYDIORGANOSILOXANE WHEREIN THE ORGANO GROUPS ARE SELECTED FROM THE GROUP CONSISTING OF THE METHYL, ETHYL AND 2-PEHNYLPROPYL GROUPS, SAID FLUID HAVING A METHYL TO SILICON RATIO OF ABOUT 1:1, AN ETHYL TO SILICON RATIO IN THE RANGE OF .7 TO 9:1 AND A 2-PEHNYLPROPYL TO SILICON RATIO IN THE RANGE OF .1 TO 3:1, (2) ABOUT 3 PERCENT BY WEIGHT OF SILICA HAVING A SURFACE AREA OF ABOUT 225 SQUARE METERS PER GRAM, AND (3) ABOUT 1 PERCENT BY WEIGHT OF A HYDROXYLATED POLYDIMETHYLSILOXANE FLUID, AT A TEMPERATURE OF AT LEAST 100*C. WHILE THE MIXTURE IS BEING SUBJECTED TO A SHEARING ACTION WHEREBY A FOAM CONTROL AGENT HAVING IMPROVED STABILITY IS OBTAINED.
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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) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |