Patent US2493343A successfully refreshed from Google Patents.
US2493343A
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Stabilization of polymerizable mixtures
Assignee: PPG Industries Inc
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Filing: 1944-09-21
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Granted: 1950-01-03
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Expires: 1964-09-21
Abstract
No abstract record available.
Inventors
- 👤 Howard L Gerhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:04
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F2/00; C08F2/38; C08F220/00; C08F220/62; C08F220/68; C08F222/00; C08F222/04; C08F222/06; C08F222/08; C08F222/10; C08F222/1006; C08F222/102
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
IN A METHOD OF FORMING A RESINOUS PRODUCT BY CONJOINTLY POLYMERIZING A MIXTURE OF STYRENE AND AN ESTER OF ENDOMETHYLENE TETRAHYDROPHTHALIC ACID AND A GLYCOL OF A CLASS CONSISTING OF DIETHYLENE GLYCOL AND TRIETHYLENE GLYCOL AND IN WHICH THE MIXTURE IS MADE UP AND IS MAINTAINED AT ROOM TEMPERATURE A SUBSTANTIAL PERIOD OF TIME BEFORE POLYMERIZATION, THE STEPS OF MAINTAINING THE MIXTURE IN INTIMATE CONTACT WITH OXYGEN PRIOR TO POLYMERIZATION BY BUBBLING GAS CONTAINING OXYGEN THERETHUR, WHEREBY TO PREVENT POLYMERIZATION AND THEN JUST PRIOR TO POLYMERIZATION, DISCONTINUING THE SUPPLY OF OXYGEN.
References Cited (Backward Citations)
US2168808A
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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) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |