US2800434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of aqueous methacrolein
Assignee: —
•
Filing: —
•
Granted: 1957-07-23
•
Expires: 1974-07-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:51
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/383; C07C47/00; C07C47/20; C07C47/21; C07C47/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
PROCESS WHICH COMPRISES DISTILLING AN AQUEOUS METHACROLEIN SOLUTION IN A STRIPPING SECTION OF THE USUAL IRONCONTAINING EQUIPMENT IN WHICH THE IRON TENDS TO POLYMERIZE VAPOURS OF METHACROLEIN AND RECTIFYING AND CONDENSING METHACROLEIN VAPOURS COMING FROM SAID STRIPPING SECTION IN EQUIPMENT MADE OF MATERIAL FREE FROM IRON IONS, WHEREBY POLYMERIZATION OF SAID METHACROLEIN IS SUBSTANTIALLY AVOIDED.
Claim 2
Dependent Claim
55 words
PROCESS WHICH COMPRISES DISTILLING AN AQUEOUS METHACROLEIN SOLUTION IN A STRIPPING SECTION OF THE USUAL IRONCONTAINING EQUIPMENT IN WHICH THE IRON TENDS TO POLYMERIZE VAPOURS OF METHACROLEIN AND RECTIFYING AND CONDENSING METHACROLEIN VAPOURS COMING FROM SAID STRIPPING SECTION IN EQUIPMENT MADE OF MATERIAL FREE FROM IRON IONS, WHEREBY POLYMERIZATION OF SAID METHACROLEIN IS SUBSTANTIALLY AVOIDED.
References Cited (Backward Citations)
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Cited
US2407861A
Cited
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Cited
US2446969A
Cited
US2478045A
Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |