US PATENT SUBCLASS 359 / 590
.~.~.~ Having another filter

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

577  DF  LIGHT INTERFERENCE {2}
580  DF  .~ Produced by coating or lamina {7}
589  DF  .~.~ Selective wavelength transmission or reflection {1}
590.~.~.~ Having another filter

DEFINITION

Classification: 359/590

Having another filter:

(under subclass 589) Subject matter having both an interference filter and another type of filter (e.g., absorption filter).