Phototropic glass
Abstract
Abstract THE PRESENT INVENTION RELATES TO PHOTOTROPIC TO PROCESSES FOR PRODUCING A PHOTOTROPIC GLASS. A PHOTOTROPIC GLASS IS ONE WHICH HAS THE ABILITY TO COLOR OR DARKEN IN COLOR WHEN RADIATED WITH LIGHT OF A PARTICULAR WAVE LENGTH REGION AND WHOSE INDUCED COLOR FADES RAPIDLY, THAT IS, WITHIN A FEW MINUTES AFTER THE EXCITING RADIATION IS REMOVED. THE PRESENT INVENTION PARTICULARLY RELATES TO GLASSES WHICH EXHIBIT A PHOTOTROPIC EFFECT WHEN RADIATED WITH ULTRAVIOLET LIGHT OR SUNLIGHT. THE INVENTION ESPECIALLY RELATES TO PHOTOTROPIC POTASSIUM BORATE GLASSES COMPRISING A GLASS BODY HAVING IN A LEAST A PORTION THEREOF MICROCRYSTALS OF AT LEAST ONE SILVER HALIDE SUCH AS SILVER CHLORIDE, SILVER BROMIDE, OR SILVER IODIDE OR MIXTURES THEREOF.
Inventors
- 👤 Lowell L Sperry
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |