1976-01-14
1978-04-04
Clark, Conrad J.
350213, 350276R, G02B 308
Patent
active
040824330
ABSTRACT:
Louvered echelon lenses are provided that comprise an optically clear layer having at least one of its large-area surfaces configured as a set of echelon lens elements, and physically attached in optical connection with said layer, an internally louvered layer that comprises an optically clear polymeric matrix and a set of thin optically limiting louvers supported within the matrix in a spaced side-by-side relation.
REFERENCES:
patent: RE27617 (1973-04-01), Olsen
patent: 3134021 (1964-05-01), Ploke
patent: 3511563 (1970-05-01), Erwin
patent: 3661385 (1972-05-01), Schneider
patent: 3712707 (1973-01-01), Henkes, Jr.
patent: 3861785 (1975-01-01), Barbour
patent: 3972593 (1976-08-01), Appledorn et al.
Anderson Raymond H.
Appeldorn Roger H.
Alexander Cruzan
Clark Conrad J.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tamte Roger R.
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