Ultraviolet protected electrochemichromic rearview mirror

  • US 5,355,245 A
  • Filed: 06/25/1993
  • Issued: 10/11/1994
  • Est. Priority Date: 02/12/1988
  • Status: Expired due to Term
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First Claim
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1. An ultraviolet radiation protected electrochemichromic rearview mirror assembly comprising:

  • first and second spaced, optically transparent elements, said elements each having front and rear surfaces and defining a space between the rear surface of said first element and the front surface of said second element;

    an electrochemichromic medium confined in said space whose light transmittance is variable upon the application of an electric field thereto; and

    means for applying an electric field to said electrochemichromic medium to cause variation in the light transmittance of said medium;

    said electrochemichromic medium comprising at least 1.2% by weight to volume of one of a) an ultraviolet radiation reducing additive in solution in said electrochemichromic medium and b) a mixture of at least two ultraviolet radiation reducing additives in solution in said electrochemichromic medium, said additive and additives comprising said mixture being selected from the group consisting of benzophenones, cinnamic acid derivatives, esters of benzoin acids, salicylic acid, terephthalic and isophthalic acids with resorcinol and phenols, pentamethyl piperidine derivatives, salicylates, benzotriazoles, cyanoacrylates, benzilidenes, malonates, oxalanilides, nickel chelates and hindered amines, wherein said additive and said mixture of at least two additives does not affect the function of said electrochemichromic medium and does not oxidize or reduce in said electrochemichromic rearview mirror assembly during operation thereof.

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