US3580720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic sensitized papers excellent in fluorescent brightening effect and process for preparing the same
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1969-03-26
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Granted: 1971-05-25
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Expires: 1989-03-26
Abstract
Abstract A PHOTOGRAPHIC SENSITIZED PAPER CAN BE GREATLY ENHANCED IN FLUORESCENT BRINGTNEING EFFECT BY INCORPORATING INTO A BINDER IN THE PHOTOGRAPHIC LAYER A STARCH DERIVATIVE HAVING IN COMBINATION A AMINOGULANIDINE GROUP AND AN ALKEHYDE GROUP. THIS STARCH DERIVATIVE IS A MORDANT WHICH MAKES THE BINDER COMPLETELY NON-DIFFUSIBLE TO A FLUORESCENT DYE.
Inventors
- 👤 Yasushi Ohyama
- 👤 Sadayuki Miyazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/303; G03C1/76; G03C1/775; G03C1/79; G03C1/815; G03C1/8155
Claims Analysis
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |