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US 4,400,412 AGranted
Thermochromic vanadium oxide coated glass
AssigneePPG Industries, Inc.
InventorsJ. Kevin Scanlon, Charles B. Greenberg
Life of this patent
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Abstract
A method is disclosed for producing a thermochromic window comprising a glass substrate and a coating containing VO.sub.2 by chemical vapor deposition employing vanadium n-propylate in an oxidizing atmosphere.
Claims5
A method for making a thermochromic window comprising the steps of:
- a. heating a glass substrate to a sufficient temperature to convert vanadium n-propylate to vanadium oxide;
- b. vaporizing vanadium n-propylate;
- c. conveying the vaporized vanadium n-propylate to said substrate in an atmosphere sufficiently oxidizing to form a thermochromic film comprising VO.sub.2 but insufficiently oxidizing to form a film which is not thermochromic as a result of the proportion of V.sub.2 O.sub.5 ;
- d. contacting a surface of said heated glass substrate with said vapor of vanadium n-propylate in said oxidizing atmosphere to deposit thereupon a film containing VO.sub.2.
1 more element
Dependencies are inferred from the claim text.