US3700440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dodging method in which the photochromic material is stable to light and heat
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1965-05-20
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Granted: 1972-10-24
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Expires: 1985-05-20
Abstract
Abstract AN IMPROVED PHOTOGRAPHIC MEDIUM IS DISCLOSED COMPRISING A TRANSPARENT SUBSTRATE WITH A RADIATION SENSITIVE SYSTEM THEREON COMPRISING A DISPERSION OF A PHOTOCHROMIC MATERIAL IN A POLYMERIC BINDER CONTAINING AT LEAST 5% BY WEIGHT OF POLAR GROUPS HAVING THE STRUCTURAL FORMULAE (-CH(-X)-CH2-) WHERE X REPRESENTS A HYDROXYL GROUP, ANAMINO GROUP, A HYDROXYL ETHER GROUP, AN AMINO ETHER GROUP OR COMBINATIONS OF THESE. THIS PHOTOGRAPHIC MEDIUM IS USEFUL IN PHOTOGRAPHIC DODGING PROCESSES.
Inventors
- 👤 Gerald L Mcleod
- 👤 Hollis E French
- 👤 Laura K Case
- 👤 Elliot Berman
- 👤 Joseph Casella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |