US2477462A
Expired / Lapsed
US
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Polymeric color formers from hydroxyl polymers containing reactive ketaldone groups with reactive methylene and amino color formers
Assignee: EIDP Inc
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Filing: 1946-03-26
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Granted: 1949-07-26
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Expires: 1966-03-26
Abstract
No abstract record available.
Inventors
- 👤 Mcqueen David Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:30
CPC Classifications
C; C08; C08F; C08F8/00; Y; Y10; Y10S; Y10S534/00; Y10S534/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2332897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |