Patent US2821520A successfully refreshed from Google Patents.
US2821520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated esters of alkoxybenzene dicarboxylic acids and polymers thereof
Assignee: General Electric Co
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Filing: 1956-04-13
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Granted: 1958-01-28
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Robert E Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:02
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AN UNSATURATED ESTER OF AN ALKOXYBENZENE DICARBOXYLIC ACID HAVING THE FORMULA
Claim 2
Dependent Claim
11 words
AN UNSATURATED ESTER OF AN ALKOXYBENZENE DICARBOXYLIC ACID HAVING THE FORMULA
References Cited (Backward Citations)
US2501610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |