Patent US3749578A successfully refreshed from Google Patents.
US3749578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image-receiving material for use in silver salt diffusion transfer photography
Assignee: Fujifilm Holdings Corp
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Filing: 1971-09-07
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Granted: 1973-07-31
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Expires: 1991-09-07
Abstract
Abstract AN IMAGE-RECEIVING MATERIAL CONTAINING A SPECIFIC AMINE COMPOUND SUCH AS BIS-(B-HYDROXYETHYL) AMINE, TRIS-(B-HYDROXYETHYL) AMINE, OR N-B-HYDROXYETHYL PIPERIDINE IN AT LEAST ONE OF EITHER ITS RECEIVING LAYER OR AN ADJACENT LAYER. THE AMINE COMPOUND SERVES TO ENHANCE THE ACTIVITY OF A DEVELOPMENT NUCLEUS CONTAINED IN THE RECEIVING LAYER.
Inventors
- 👤 K Ohkubo
- 👤 K Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:43
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |