Composite filter, observation system and filamentary display dev

Details Composite filter, observation system and filamentary display dev Composite filter, observation system and filamentary display dev

1984-07-10

1986-10-14

Fields, Carolyn E.

350 16, G02B 522

Patent

active

046169024

ABSTRACT:
A composite filter (i) which transmits starlight radiation having a wavelength of 400 up to but not including 600 nm and (ii) does not transmit radiation having a wavelength of 600 to 900 nm comprising at least one organic film filter and at least one glass filter, in which said organic film filter absorbs light radiation having a wavelength of 600-700 nm and said glass filter comprises a glass plate colored with a cobalt-containing salt which absorbs light radiation having a wavelength of 700-900 nm.

REFERENCES:
patent: 2418605 (1947-04-01), Shepherd, Jr. et al.
patent: 2525638 (1950-10-01), Blout et al.

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