US3674489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic image amplifying with copper ions
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-07-11
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Granted: 1972-07-04
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Expires: 1988-07-11
Abstract
Abstract THIS DISCLOSURE RELATES TO PHOTOGRAPHIC AMPLIFYING SYSTEMS COMPRISED OF A SOLUTION OF COPPER IONS AND CERTAIN REDUCING AGENTS WHICH SELECTIVELY DEPOSIT COPPER COPPER METAL ON LATENT METAL PHOTOGRAPHIC IMAGES TO INCREASE THE DENSITY OF THE IMAGES. THE AMPLIFYING SYSTEMS ARE PARTICULARLY EFFECTIVE WITH LATENT METAL IMAGES OF PHOTOGRAPHIC MEDIA COMPRISING A RADIATION ACTIVATED PHOTOCONDUCTOR. ALSO DESCRIBED ARE PROCESSES FOR AMPLIFYING PHOTOGRAPHIC IMAGES.
Inventors
- 👤 John E Wyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:00
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/58; G03C1/00; G03C1/705; Y; Y10; Y10S; Y10S430/00; Y10S430/148
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |