Patent US3679421A successfully refreshed from Google Patents.
US3679421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dye-forming system including a boric acid ester
Assignee: Eastman Kodak Co
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Filing: 1969-08-26
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Granted: 1972-07-25
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Expires: 1989-08-26
Abstract
Abstract THE RESISTANCE TO PREMATURE COUPLING AND THE DEVELOPMENT RATE OF TWO-COMPONENT DIAZOTYPE COMPOSITIONS I.E., AT LEAST ONE DIAZONIUM SALT AND AT LEAST ONE COUPLER COMPOUND) ARE ADVANTAGEOUSLY INCREASED BY THE INCLUSION THEREIN OF A BORIC ACID ESTER.
Inventors
- 👤 George P Kasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:50
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |