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Package for photographic film and material and powders for making same
   
Document Number
US Patent 4174038
Issued Date
November 13, 1979
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Abstract
A thinner, less-expensive-to produce, and more easily handled, opaque sheet is formed by coextrusion of two polymeric layers containing relatively low loadings of black pigment around a third layer of polymer which is pigmented at levels higher than would be practical using conventional extrusion processes, rather than a coextrusion procedure. The sheet is an improved product for use in packaging photographic film or like products to be protected from light.
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Package for photographic film and material and powders for making same - US Patent 4174038 Drawing
Drawing from US Patent 4174038
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Number of Claims:
14
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Owner
Ludlow Corporation (Needham Heights, MA)
Published
November 13, 1979
Application Number
05/774,934
Filed
March 7, 1977
US Classification
206/389   206/524.2
Int'l Classification
B32B   27/20   (20060101)   G03C   3/00   (20060101)  
Examiner
USPTO Field of Search
206/524.2   206/389   206/455  
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