Patent US3142661A successfully refreshed from Google Patents.
US3142661A
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Polymerization of acrolein and methacrolein
Assignee: Evonik Operations GmbH
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Filing: 1961-05-31
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Granted: 1964-07-28
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Expires: 1981-05-31
Abstract
No abstract record available.
Inventors
- 👤 Brendlein Heinrich
- 👤 Bader Erich
- 👤 Leyerzapf Hermann
- 👤 Rink Karl-Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:48
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/14; C08G2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A PROCESS FOR THE CATALYTIC POLYMERIZATION OF AN ACROLEIN COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACROLEIN AND METHACROLEIN IN THE PRESENCE OF WATER, THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SOLUTION OF SUCH ACROLEIN COMPOUND OF A CONCENTRATION BETWEEN 5% AND ITS SATUATION POINT, SUCH SOLUTIONBEING DEVOID OF POLYMERIZATION CATALYSTS, HOLDING SUCH SOLUTION FOR A PERIOD OF 3 TO 100 HOURS AT 20 TO 60*C. AND ONLY THEREAFTER ADDING THE POLYMERIZATION CATALYST TO THE THUS HELD SOLUTION TO EFFECT POLYMERIZATION.
Claim 2
Dependent Claim
82 words
IN A PROCESS FOR THE CATALYTIC POLYMERIZATION OF AN ACROLEIN COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACROLEIN AND METHACROLEIN IN THE PRESENCE OF WATER, THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SOLUTION OF SUCH ACROLEIN COMPOUND OF A CONCENTRATION BETWEEN 5% AND ITS SATUATION POINT, SUCH SOLUTIONBEING DEVOID OF POLYMERIZATION CATALYSTS, HOLDING SUCH SOLUTION FOR A PERIOD OF 3 TO 100 HOURS AT 20 TO 60*C. AND ONLY THEREAFTER ADDING THE POLYMERIZATION CATALYST TO THE THUS HELD SOLUTION TO EFFECT POLYMERIZATION.
References Cited (Backward Citations)
US2996481A
Cited
US3036978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |