Visibly opaque infrared transmitting optical filter containing a

Details Visibly opaque infrared transmitting optical filter containing a Visibly opaque infrared transmitting optical filter containing a

1975-06-16

1977-08-02

Padgett, Benjamin R.

Compositions

Inorganic luminescent compositions

Tungsten containing

F21V 906

Patent

active

040394670

ABSTRACT:
Optical filters comprised of a plastic film having incorporated therein a mixture of dyes including defined amounts of a copper phthalocyanine sulfonamide compound and a vanadyl phthalocyanine sulfonamide compound are substantially opaque to visible light but permit a high transmission of radiation in the near infrared region.

REFERENCES:
patent: 2300572 (1942-11-01), Hoyer et al.
patent: 3291746 (1966-12-01), Donoian
patent: 3853783 (1974-12-01), Tucker

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