US3697272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making non-silver free radical film images visible
Assignee: Horizons Research Inc
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Filing: 1971-06-18
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Granted: 1972-10-10
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Expires: 1991-06-18
Abstract
Abstract AN IMPROVEMENT OVER THE OPTICAL DEVELOPMENT PROCEDURE DISCLOSED IN UNIT STATES PATENT 3,510,300 WHICH RESIDES IN THE USE OF TWO SEPARATE EXPOSURE TO RADIATION OF TWO DIFFERENT WAVELENGTHS TO DEVELOP A VISIBLE IMAGE FROM A LATENT IMAGE BEARING MATERIAL, THE FIRST EXPOSURE BEING A BRIEF EXPOSURE TO RADIATION OF RELATIVELY SHORTER WAVELENGTH AND THE SECOND EXPOSURE BEING TO RELATIVELY LONGER WAVELENGTH RADIATION.
Inventors
- 👤 Lothar Ramins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/675
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |