Patent US2520338A successfully refreshed from Google Patents.
US2520338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo compounds containing carboxyl and cyano groups
Assignee: EIDP Inc
•
Filing: 1947-06-27
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Granted: 1950-08-29
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Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 James A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:34
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/04; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN AZO COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN AZO COMPOUND OF THE FORMULA
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 |