Patent US2652428A successfully refreshed from Google Patents.
US2652428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-alkyl-n-(beta-methylsulfonamidoethyl)-p-aminophenols
Assignee: Eastman Kodak Co
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Filing: 1951-05-05
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Granted: 1953-09-15
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Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Weissberger Arnold
- 👤 John R Thirtle
- 👤 Richard L Bent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:56
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/30; C07C311/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA:
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) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |