Search

• Written by: Willis D. Kleppinger ×
• Clear filters

1 result for “Owens-Corning Fiberglas”

1. Patent · June 25, 1957

   Ceramic welding ring (US Patent 2,796,843, 1957)

   …June 25, 1957, filed January 25, 1956. The patent's description opens (from the scanned text): This invention relates to an improved type of ceramic backing ring for the welding of the ends of pipe sections.