The Hepworth Iron Company Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4744741 Apparatus for the manufacture of composite articles using rotating moldsExpiredJul 07, 86May 17, 88[B29C]
4711473 Coupling pipesExpiredSep 29, 86Dec 08, 87[F16L]
4382051 Method for firing ceramic productsExpiredNov 25, 80May 03, 83[F27B]
4264301 Method and apparatus for firing ceramic productsExpiredMay 25, 79Apr 28, 81[F27B]

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