US3694207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of imagewise exposed catalase active or peroxidase active enzyme containing layer with peroxide
Assignee: Agfa Gevaert AG
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Filing: 1970-10-26
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Granted: 1972-09-26
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Expires: 1990-10-26
Abstract
Abstract FOR THE PRODUCTION OF POSITIVE PHOTOGRAPHIC IMAGES ARE USED LAYERS CONTAINING CATALASE ACTIVE AND/OR PEROXIDASE ACTIVE ENZYMES, WHICH ARE INACTIVATED ON EXPOSURE TO LIGHT, THUS BECOMING INCAPABLE OF DECOMPOSING PEROXIDE COMPOUNDS. THE PEROXIDE COMPOUNDS ARE USED EITHER TO FORM AN IMAGE OF GAS BUBBLES IN THE LAYER OR TO PRODUCE A DYE IMAGE BY A COLOR-FORMING OXIDATION REACTION. THE SENSITIVITY CAN LARGELY BE INCREASED BY SUBSTANCES WHICH ON EXPOSURE TO LIGHT LIBERATE HALOGEN OR CYANIDE, WHICH LATTER PRODUCTS ACTS AS POISONS FOR THE ENZYMES.
Inventors
- 👤 Reinhart Matejec
- 👤 Erwin Ranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:49
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/60; G03C1/00; G03C1/64; G03C1/675; G03C1/72; G03C1/73; G03C1/731; G03C5/56; Y; Y10; Y10S; Y10S430/00; Y10S430/144
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |