(19)
(11) EP 0 003 174 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.08.1979 Bulletin 1979/16

(43) Date of publication A2:
25.07.1979 Bulletin 1979/15

(21) Application number: 79300042

(22) Date of filing: 10.01.1979
(84) Designated Contracting States:
CH DE NL

(30) Priority: 18.01.1978 US 870386

(71) Applicant: ALLIED CHEMICAL CORPORATION
 ()

(72) Inventors:
  • Morris, Robert Graig
     ()
  • O'Dell, Earl Wayne
     ()

   


(54) Multiple element display objects


(57) Multi-element gem stones and other display objects comprising pleochroic materials are provided which evidence enhanced colors or other unusual optical properties, based on the pleochroic behavior of the material. Doublet stones, comprised of two pleochroic materials, and triplet stones, comprised of two pleochroic materials separated by an optical rotator, are described.







Search report