Patent US2389147A successfully refreshed from Google Patents.
US2389147A
Expired / Lapsed
US
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4' methoxy 5 halogeno diphenylamino 2' carboxyl compound and process for producing the same
Assignee: Individual
•
Filing: 1943-11-20
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Granted: 1945-11-20
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Expires: 1963-11-20
Abstract
No abstract record available.
Inventors
- 👤 Ernst A H Friedhelm
- 👤 Bergmann Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:55
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/04; C07C227/06
Claims Analysis
Total Claims: 0
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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) | 1948-11-19 | 1949-05-21 | 1949-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-19 | 1953-05-21 | 1953-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-19 | 1957-05-21 | 1957-11-20 | $7700.00 | Window Closed / Lapsed |