US2643240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxane antifoam agents
Assignee: Union Carbide Corp
•
Filing: 1950-04-13
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Granted: 1953-06-23
•
Expires: 1970-04-13
Abstract
No abstract record available.
Inventors
- 👤 Richard K Walton
- 👤 Philip A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN ANTI-FOAM AGENT COMPOSED OF AN ETHYL SILOXANE POLYMER HAVING A RATIO OF ETHYL GROUPS TO SILICON ATOMS OF ABOUT 1 TO 1, SAND ETHYL SILOXANE POLYMER HAVING BEEN CONDENSED AND EQUILIBRATED IN THE PRESENCE OF A MINERAL ACID CATALYST TO SUCH A DEGREE OF CONDENSATION THAT, AFTER HEATING THE ANTI-FOAM AGENT FOR ONE HOUR AT 145* C. TO OBTAIN A RESIDUE THE RESIDUE CONTAINS FROM 88 TO 94% BY WEIGHT OF MATERIAL WHICH DOES NOT VOLATILIZE ON HEATING SUCH RESIDUE FOR ONE HOUR AT 200* C.
Claim 2
Dependent Claim
87 words
AN ANTI-FOAM AGENT COMPOSED OF AN ETHYL SILOXANE POLYMER HAVING A RATIO OF ETHYL GROUPS TO SILICON ATOMS OF ABOUT 1 TO 1, SAND ETHYL SILOXANE POLYMER HAVING BEEN CONDENSED AND EQUILIBRATED IN THE PRESENCE OF A MINERAL ACID CATALYST TO SUCH A DEGREE OF CONDENSATION THAT, AFTER HEATING THE ANTI-FOAM AGENT FOR ONE HOUR AT 145* C. TO OBTAIN A RESIDUE THE RESIDUE CONTAINS FROM 88 TO 94% BY WEIGHT OF MATERIAL WHICH DOES NOT VOLATILIZE ON HEATING SUCH RESIDUE FOR ONE HOUR AT 200* C.
References Cited (Backward Citations)
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Cited
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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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |