US2393889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n, n'-dicycloaliphatic-p-phenylenediamines
Assignee: Wyeth Holdings LLC
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Filing: 1941-11-29
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Granted: 1946-01-29
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Expires: 1961-11-29
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Cook
- 👤 Jr William D Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:46
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/16; C09K15/18
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) | 1949-01-28 | 1949-07-30 | 1950-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-01-28 | 1953-07-30 | 1954-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-01-28 | 1957-07-30 | 1958-01-29 | $7700.00 | Window Closed / Lapsed |