Patent US2494059A successfully refreshed from Google Patents.
US2494059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-di-(sec-alkylamino)-diphenylamines
Assignee: Eastman Kodak Co
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Filing: 1945-11-15
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Granted: 1950-01-10
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Expires: 1965-11-15
Abstract
No abstract record available.
Inventors
- 👤 Albert C Ruggles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:51
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/223; C10L1/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A 4,4'' - DI-(SEC-ALKYLAMINO) DIPHENYLAMINE SELECTED FROM THE GROUP CONSISTING OF 4,4''-DIISOPROPYLAMINODIPHENYLAMINE AND 4,4''-DI-(SECBUTYLAMINO) DIPHENYLAMINE.
Claim 2
Dependent Claim
15 words
A 4,4'' - DI-(SEC-ALKYLAMINO) DIPHENYLAMINE SELECTED FROM THE GROUP CONSISTING OF 4,4''-DIISOPROPYLAMINODIPHENYLAMINE AND 4,4''-DI-(SECBUTYLAMINO) DIPHENYLAMINE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |