Patent US2819252A successfully refreshed from Google Patents.
US2819252A
Expired / Lapsed
US
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Polymerization of acrolein
Assignee: Shell Development Co
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Filing: 1954-10-25
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Granted: 1958-01-07
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Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Edward C Shokal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:39
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/14; C08G2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR POLYMERIZING ACROLEIN WHICH CONSISTS OF MIXING A MONOMER COMPOSITION CONTAINING ACROLEIN WITH FROM 0.1% BY WIEGHT OF THE TOTAL MONOMER OF AN OXIDE OF A METAL OF THE GROUP CONSISTING OF COPPER, SILVER, CESIUM, BERYLLIUM, MERCURY, LEAD AND TIN AT A TEMPERATURE BETWEEN 0*C. AND 100*C.
Claim 2
Dependent Claim
49 words
A PROCESS FOR POLYMERIZING ACROLEIN WHICH CONSISTS OF MIXING A MONOMER COMPOSITION CONTAINING ACROLEIN WITH FROM 0.1% BY WIEGHT OF THE TOTAL MONOMER OF AN OXIDE OF A METAL OF THE GROUP CONSISTING OF COPPER, SILVER, CESIUM, BERYLLIUM, MERCURY, LEAD AND TIN AT A TEMPERATURE BETWEEN 0*C. AND 100*C.
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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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |