Patent US2256403A successfully refreshed from Google Patents.
US2256403A
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Acridine compounds and material colored therewith
Assignee: Eastman Kodak Co
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Filing: 1940-06-13
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Granted: 1941-09-16
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Expires: 1960-06-13
Abstract
No abstract record available.
Inventors
- 👤 James G Mcnally
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/576; C07F9/64; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C07F9/16; C07F9/165; C07F9/1651; C07F9/22; C07F9/24; C07F9/2404; C07F9/2408
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) | 1944-09-15 | 1945-03-17 | 1945-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-15 | 1949-03-17 | 1949-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-15 | 1953-03-17 | 1953-09-16 | $7700.00 | Window Closed / Lapsed |