Patent US2520339A successfully refreshed from Google Patents.
US2520339A
Expired / Lapsed
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Araliphatic azo catalysts for addition polymerization
Assignee: EIDP Inc
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Filing: 1948-04-13
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Granted: 1950-08-29
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Expires: 1968-04-13
Abstract
No abstract record available.
Inventors
- 👤 James A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:24
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
IN THE ADDITION POLYMERIZATION OF POLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUNDS, THE IMPROVEMENT WHEREIN THE POLYMERIZATION IS EFFECTED BY BRINGING SAID COMPOUND IN CONTACT WITH AN AZO COMPOUND
Claim 2
Dependent Claim
26 words
IN THE ADDITION POLYMERIZATION OF POLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUNDS, THE IMPROVEMENT WHEREIN THE POLYMERIZATION IS EFFECTED BY BRINGING SAID COMPOUND IN CONTACT WITH AN AZO COMPOUND
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |