Patent US3598587A successfully refreshed from Google Patents.
US3598587A
Expired / Lapsed
US
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Photographic physical developers
Assignee: Eastman Kodak Co
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Filing: 1968-04-22
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Granted: 1971-08-10
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Expires: 1988-04-22
Abstract
Abstract A NOVEL PHYSICAL DEVELOPER FOR PALLADIUM LATENT IMAGES COMPRISES A REDUCIBLE HEAVY METAL SALT, A COMPLEXING AGENT FOR THE HEAVY METAL IONS, A REDUCING AGENT FOR THE HEAVY METAL IONS AND A CARBOXYLIC ACID COMPLEXING AGENT HAVING A HIGH DEGREE OF SPECIFICITY TOWARDS PALLADIUM IONS.
Inventors
- 👤 Joseph S Yudelson
- 👤 Barbara F Dernbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/50; C; C08; C08F; C08F8/00; C08F8/14; G03C1/005; G03C1/04; G03C8/00; G03C8/02; G03C8/04
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |