Patent US2566203A successfully refreshed from Google Patents.
US2566203A
Expired / Lapsed
US
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Dimerization of methacrylonitrile to alpha-methylene-delta-methyladiponitrile
Assignee: EIDP Inc
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Filing: 1950-04-26
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Granted: 1951-08-28
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Expires: 1970-04-26
Abstract
No abstract record available.
Inventors
- 👤 Milton J Hogsed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:38
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR THE PREPARATION OF ALPHAMETHYLENE-DELTA-METHYLADIPONITRILE WHICH COMPRISES HEATING METHACRYLONITRILE FREE FORM A POLYMERIXATION INITIATOR AT A TEMPERATURE WITHIN THE RANGE OF 300* TO 400* C. FOR PERIOD OF TIME NOT SUBSTANTIALLY EXCEEDING 15 MINUTES AND UNDER A PRESSURE SUFFICIENT TO MAINTAIN A LIQUID PHASE, AND SEPARATING FROM THE REACTION MIXTURE ALPHAMETHYLENE-DELTA-METHYLADIPONITRILE.
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE PREPARATION OF ALPHAMETHYLENE-DELTA-METHYLADIPONITRILE WHICH COMPRISES HEATING METHACRYLONITRILE FREE FORM A POLYMERIXATION INITIATOR AT A TEMPERATURE WITHIN THE RANGE OF 300* TO 400* C. FOR PERIOD OF TIME NOT SUBSTANTIALLY EXCEEDING 15 MINUTES AND UNDER A PRESSURE SUFFICIENT TO MAINTAIN A LIQUID PHASE, AND SEPARATING FROM THE REACTION MIXTURE ALPHAMETHYLENE-DELTA-METHYLADIPONITRILE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |