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• Person: Walter L. Steffens ×
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2 results for “Owens-Illinois”

1. Patent · July 16, 1929

   Heat Insulating and Fireproofing Material (US Patent 1,721,096, 1929)

   …received US Patent No. 1,721,096 on July 16, 1929, filed March 3, 1922. The patent's description opens (from the scanned text): My invention relates to a flexible non-heat conducting and fireproof material.

2. Patent · September 25, 1934

   Heat Insulating Unit (US Patent 1,974,519, 1934)

   Walter L. Steffens received US Patent No. 1,974,519 on September 25, 1934, filed July 5, 1929. The patent's description opens (from the scanned text): My invention relates to insulation for build-' Fig. 2.