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Infra-red filter media

  • US 2,813,802 A
  • Filed: 02/24/1955
  • Issued: 11/19/1957
  • Est. Priority Date: 02/24/1955
  • Status: Expired due to Term
First Claim
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1. A SOLID PELLUCID MATERIAL HAVING PHYSICALLY ASSOCIATED THEREWITH A BIS(P-AMINOPHENYL) VINYL CARBONIUM COMPOUND OF THE CLASS

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