Disclosing light
Abstract
Abstract A lighting device for viewing calculus, (plaque), tartar, and the like on a person''s teeth, the device utilizing a fluorescent lamp with a phosphor such as calcium strontium magnesium silicate, activated by europium, to emit light mainly in the 400 to 520 nanometers wavelength region, that is in the blue and green region, but not the yellow, to produce a yellow fluorescent emission from any calculus or tartar on the teeth. The teeth are first treated with a fluorescent material such as a weak sodium fluorescein solution to provide the calculus with phosphor material. In viewing, it is best to use a filter which excludes blue and green light in order to make the amount of reflected light from the part of the teeth which do not have calculus on them as small as possible. This can be done by viewing the teeth in a dichroic reflector which passes blue and green but reflects yellow. The device can also be used for viewing other parts of the body, and for other purposes.
Inventors
- 👤 E Audesse
- 👤 A Westlund
- 👤 T Sadoski
Bibliographic Details
Claims Analysis
Total Claims: 1References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |