Patent US3595657A successfully refreshed from Google Patents.
US3595657A
Expired / Lapsed
US
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Non-silver direct positive dye bleachout system using indigoid dyes and colorless activators
Assignee: Arthur D Little Inc
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Filing: 1968-10-03
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Granted: 1971-07-27
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Expires: 1988-10-03
Abstract
Abstract A DIRECT POSITIVE BLEACH-OUT PHOTOGRAPHIC SYSTEM SUITABLE FOR PHOTOGRAPHY AND PHOTOCOPY WORK. AN INDIGOID DYE AND ACTIVATOR, SUPPORTED IN A BINDER, FROM THE PHOTOSENSITIVE SYSTEM WHICH IS BLEACHED OUT WHEN EXPOSED TO ULTRAVIOLET LIGHT.
Inventors
- 👤 Ian D Robinson
- 👤 Joanne C Gerlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/02
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |