US2884474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-foam agents in separation of olefines from solvent
Assignee: Polysar Ltd
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Filing: 1956-04-23
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Granted: 1959-04-28
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Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 Charles M Finigan
- 👤 Spehar John Phillip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:36
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN THE PROCESS OF EXPELLING, BY HEAT, AN OLEFINIC HYDROCARBON HAVING AT LEAST 4 CARBON ATOMS IN THE OLEFINIC CHAIN, SAID HYDROCARHON BEING DISSOLVED IN A SOLVENT COMPRISING AN AMMONIACAL SOLUTION OF COPPER IONS WITH AN ANION CAPABLE OF RORMING CUPROUS SALTS SOLUBLE IN SAID AMMONIACAL SOLUTION, THE OLEFINIC HYDROCARBON BEING RECOVERED IN VAPORIZED STATE TO LEAVE A STRIPPED SOLVENT AND THE STRIPPED SOLVENT BEING RECOVERED IN LIQUID STATE, SAID STRIPPED SOLVENT HAVING DISSOLVED THEREIN FOAM PRODUCING MATERIALS, THE IMPROVEMENT WHICH COMPRISES INHIBITING FOAM DURING SAID EXPULSION BY THE ADDITION, TO SAID OLEFIN-CONTAINING SOLVENT, OF A NON-IONIC SURFACE ACTIVE ESTER OF A FATTY ACID CONTAINING 12-18 CARBON ATOMS.
Claim 2
Dependent Claim
108 words
IN THE PROCESS OF EXPELLING, BY HEAT, AN OLEFINIC HYDROCARBON HAVING AT LEAST 4 CARBON ATOMS IN THE OLEFINIC CHAIN, SAID HYDROCARHON BEING DISSOLVED IN A SOLVENT COMPRISING AN AMMONIACAL SOLUTION OF COPPER IONS WITH AN ANION CAPABLE OF RORMING CUPROUS SALTS SOLUBLE IN SAID AMMONIACAL SOLUTION, THE OLEFINIC HYDROCARBON BEING RECOVERED IN VAPORIZED STATE TO LEAVE A STRIPPED SOLVENT AND THE STRIPPED SOLVENT BEING RECOVERED IN LIQUID STATE, SAID STRIPPED SOLVENT HAVING DISSOLVED THEREIN FOAM PRODUCING MATERIALS, THE IMPROVEMENT WHICH COMPRISES INHIBITING FOAM DURING SAID EXPULSION BY THE ADDITION, TO SAID OLEFIN-CONTAINING SOLVENT, OF A NON-IONIC SURFACE ACTIVE ESTER OF A FATTY ACID CONTAINING 12-18 CARBON ATOMS.
References Cited (Backward Citations)
US2411105A
Cited
US2497150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |