Photochromic image device
Abstract
Abstract AN IMAGE DISPLAY AND STORAGE DEVICE HAS A PHOTOCHROMIC IMAGE SCREEN CONSISTING OF SODALITE HAVING THE BASIC CHEMICAL COMPOSITION NA6A16SI6O24-2NAX WHEREIN X IS AT LEAST ONE HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE, BROMINE AND IODINE AND WHEREIN THE SODALITE CONTAINS FROM AT LEAST 50 PARTS PER MILLION OF IRON UP TO THE SOLUBILITY LIMIT OF IRON IN THE SODALITE. THE SODALITE IS ANNEALED IN A REDUCING ATMOSPHERE TO PRODUCE ITS PHOTOCHROMIC PROPERTIES. SUCH AN IMGE SCREEN DARKENS UPON EXPOSURES TO ULTRAVIOLET LIGHT OR CATHODE RAY EXCITATION. AN ESPECIALLY HIGH CONTRAST RATIO IMAGE SCREEN CAN BE ATTAINED UTILIZING SODALITE DOPED WITH IRON WHICH IS TREATED BY HEATING THE SODALITE IN A FUSED ALKALI HALIDE SALT BATH.
Inventors
- 👤 William Phillips
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |