| Patent Number |
Title Of Patent |
Date Issued |
| 4826286 |
Filter with three-band transmission for good seeing |
May 2, 1989 |
| Filter system operates to provide reasonable seeability for human visual system while simultaneously limiting the total radiation energy impinging upon the eye. System comprises a transparent substrate which carries a plurality of thin layers having indices of refraction which alternatel |
| 4824246 |
Colored object which exhibits improved constancy of color appearance upon change of illuminants |
April 25, 1989 |
| Colored object which is to be illuminated by many different types of sources of illumination and which exhibits an improved constancy of color appearance upon change of illuminants. The radiation-absorbing exterior portion of the object has color-absorbing components which combine to |
| 4653925 |
Method and apparatus for measuring any of a large number of characteristics of lamplight |
March 31, 1987 |
| Method and apparatus for rapidly measuring any of a large number of characteristics of lamplight. Apparatus extracts from the illumination being measured seven narrow visible bands and one wider band of ultraviolet. The measured power in each of the visible bands is multiplied by a w |
| 4360758 |
High-intensity-discharge lamp of the mercury-metal halide type which efficiently illuminates obj |
November 23, 1982 |
| High-intensity-discharge lamp of the mercury-metal halide type efficiently illuminates objects with excellent color appearance. The arc tube filling comprises the usual inert, ionizable starting gas and mercury in predetermined amount as required to provide a predetermined operating |
| 4341978 |
High-intensity-discharge lamp with improved color rendition of illuminated objects |
July 27, 1982 |
| High-intensity-discharge lamp is fabricated in a fashion generally similar to a standard high-pressure-mercury lamp which has a red-emitting phosphor coated on the outer envelope. In the present lamp, the discharge-sustaining filling in the arc tube is modified to include a small, pr |
| 4334782 |
Method and apparatus for expressing relative brightness of artificial illumination as perceived |
June 15, 1982 |
| Method and apparatus for expressing as a number the relative brightness of artificial illumination as it is perceived by the average observer. There is extracted (i.e., detected) from the illumination to be measured, a blue-appearing narrow band, a green-appearing narrow band, a yell |
| 4176299 |
Method for efficiently generating white light with good color rendition of illuminated objects |
November 27, 1979 |
| Method and device for efficiently generating white light with good color rendition of illuminated objects. This is achieved by blending three different colors of light, namely, a green to yellow-green color of light, an orange to red color of light, and a purplish-blue to greenish-blue |
| 4176294 |
Method and device for efficiently generating white light with good rendition of illuminated obje |
November 27, 1979 |
| Method and device for efficiently generating white light with good color rendition of illuminated objects. This is achieved by blending three different colors of light, namely, a green to yellow-green color of light, an orange to red color of light, and a purplish-blue to greenish-blue |
| 3963953 |
Color mismatch accentuating device |
June 15, 1976 |
| A device to generate light of a quality which will accent the mismatch in color appearance of objects having different spectral reflectance curves but which appear at least generally similar in color and lightness under illumination by daylight. As there are many objects which match unde |
