Disclosing light
Abstract
Abstract For dental, medical and other uses, with a disclosant phosphordye such as sodium fluorescein, a disclosing light emitting radiation substantially confined to the wavelength range between 380 and 505 nanometers (nm.) and free from infrared, yellow and ultraviolet. The light includes a source of light, which can be an incandescent lamp, a dichroic reflector behind it to reflect blue light forwardly and transmit the rest backwardly, a dichroic filter in front of the lamp to transmit blue light and reflect the infrared backwardly, and a viewing mirror for the parts irradiated, the mirror reflecting yellow light toward the observer and transmitting the other radiations. The ultraviolet, although it would excite the fluorescein, is filtered out because it would also make the natural teeth, and some kinds of artificial teeth, fluoresce and obscure the fluorescence of the fluorescein.
Inventors
- 👤 A Westlund
- 👤 E Audesse
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |