Variable transmission window

  • US 8,610,992 B2
  • Filed: 10/22/2012
  • Issued: 12/17/2013
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Term
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First Claim
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1. A variable transmission window comprising:

  • a first substrate having a first transparent conductor coated surface coated with a first transparent conductor;

    a second substrate having a second transparent conductor coated surface coated with a second transparent conductor, said second substrate positioned relative to said first substrate with said first and second transparent conductor coated surfaces facing each other;

    wherein at least one of said first transparent conductor has a thickness greater than about 300 angstroms and a sheet resistance less than about 100 ohms per square and (ii) said second transparent conductor has a thickness greater than about 300 angstroms and a sheet resistance less than about 100 ohms per square;

    an electrochromic medium disposed between said first and second substrates whereby the transmission of light through said electrochromic medium is changed when an electrical potential is applied thereto, wherein said electrochromic medium comprises a cross-linked film;

    wherein said electrochromic medium comprises at least one of (i) a viologen, (ii) a phenazine, (iii) 5,10-dihydro-5,10-dimethylphenazine, (iv) a heptyl viologen, (v) a distryrylmethyl viologen, (vi) an ethylhydroxypropyl viologen, (vii) propylene carbonate, (viii) an ultraviolet stabilizer, (ix) a phenothiazine, (x) a metallocene, (xi) a cross-linked polymer, (xii) a plasticizer, (xiii) a film formed from curing an electrochromic monomer composition, (xiv) a film formed from curing an electrochromic monomer composition comprising hydroxyundecyl viologen perchlorate, diphenylpropyl viologen diperchlorate, a ferrocene-polyol, ferrocene and 5,10-dihydro-5,10-dimethylphenazine dispersed in propylene carbonate in combination with an isocyanate, a polyol, a tin catalyst and a UV stabilizer, (xv) a film formed from curing an electrochromic monomer composition comprising hydroxyundecylphenylpropyl viologen diperchlorate, diphenylpropyl viologen diperchlorate and 5,10-dihydro-5,10-dimethylphenazine dispersed in propylene carbonate in combination with an isocyanate, a polyol, a tin catalyst and a UV stabilizer, (xvi) a film formed from curing an electrochromic monomer composition comprising hydroxyundecyl viologen perchlorate, ethyl viologen perchlorate, a ferrocene-polyol, ferrocene and 5,10-dihydro-5,10-dimethylphenazine dispersed in a mixture of tertraethyleneglycol dimethylether and tetramethylenesulfone in combination with an isocyanate, a polyol, a tin catalyst and a UV stabilizer, (xvii) a cathodic electrochromic compound, (xviii) an anodic electrochromic compound, (xix) a cathodic electrochromic compound and an anodic electrochromic compound and (xx) an electrochromic cross-linked polymer solid film; and

    wherein said window is a large area glazing of an area of at least 99 square inches.

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