Title: Optical filter

Abstract: Optical wedge filter comprising a coloured gelatine layer on a flexible transparent support and a flexible transparent covering foil bonded the gelatine layer wherein the thickness of the coloured gelatine layer increases stepwise or continuously.

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Inventors: Krekeler, Ulrich (Osterwangen, DT)
Schneller, Peter (Munich, DT)

Application Number: 470563
Filing Date: 1974-05-16
Publication_date: 1976-03-09
Assignee: AGFA-Gevaert Aktiengesellschaft (Leverkusen, DT)
Primary Class(es): 156/99 156/242, 359/888, 427/162, 427/164, 430/4, 530/354
Other Classes:
US Patent Ref:

2450746	Oct, 1948	Bliss	117/33.
2801188	Jul, 1957	Minsk	117/33.
2916968	Dec, 1959	Jackson	350/314.
3205767	Sep, 1965	Weber et al.	350/314.
3236290	Feb, 1966	Lueder	350/314.
3237513	Mar, 1966	Dreyfoos et al.	350/314.
3354025	Nov, 1967	Aykanian et al.	350/314.
3600482	Aug, 1971	Salger et al.	260/117.
3746429	Jul, 1973	Spindel et al.	350/314.
3819608	Jun, 1974	Yamamoto et al.	260/117.

Other Refs:
Primary Examiner: Drummond, Douglas J.
Assistant Examiner: Kittle, John E.
Attorney: Connolly and Hutz