Patent US3687668A successfully refreshed from Google Patents.
US3687668A
Expired / Lapsed
US
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Palladium images by hydrogen reduction
Assignee: Eastman Kodak Co
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Filing: 1970-10-07
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Granted: 1972-08-29
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Expires: 1990-10-07
Abstract
Abstract VISIBLE PALLADIUM IMAGES MAY BE FORMED BY TREATING IMAGEWISE EXPOSED PHOTOSENSITIVE ELEMENTS WITH PALLADIUM (II) ION, AND SUBSEQUENTLY FORMING PALLADIUM METAL ON SUCH IMAGEWISE FORMED PALLADIUM NUCLEI BY REDUCTION WITH HYDROGEN. FURTHER, A HEAVY METAL MAY BE IMAGEWISE DEPOSITED ON THESE PALLADIUM IMAGES BY THE USE OF STABLE HEAVY METAL PHYSICAL DEVELOPERS SUCH AS NICKEL, COBALT, IRON, PALLADIUM, PLATINUM, CHROMIUM, COPPER, ETC. SUITABLE PHOTOSENSITIVE ELEMENTS COMPRISE TITANIUM, DIOXIDE, ZINC OXIDE, LEAD CHROMATE, LEAD OXIDE, LEAD MOLYBDATE, OR COPPER OXIDE. TITANIUM DIOXIDE IS PREFERRED.
Inventors
- 👤 Michael F Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:07
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/58; G03C1/00; G03C1/705
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |