US3740229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype photographic copying material for heat development
Assignee: Ricoh Co Ltd
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Filing: 1971-04-12
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Granted: 1973-06-19
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Expires: 1991-04-12
Abstract
Abstract A DIAZOTYPE PHOTOGRAPHIC COPYING MATERIAL THAT IS HEAT DEVELOPABLE IS COMPRISED OF A SUPPORT HAVING FORMED THEREON A LIGHT-SENSITIVE LAYER CONSISTING ESSENTIALLY OF A LIGHT-SENSITIVE DIAZONIUM COMPOUND AND AN AZO DYE COUPLER CONSISTING OF A POLYHYDROXYBENZOIC ACID COMPOUND.
Inventors
- 👤 S Maruyama
- 👤 E Oida
- 👤 T Hamada
- 👤 T Asami
- 👤 S Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58; C; C07; C07C; C07C51/00; C07C51/15
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |