LaSalle Steel Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4755191 Finishing of hard chromium plated productsExpiredJul 08, 86Jul 05, 88[B24D]
4457789 Process for annealing steelsExpiredSep 01, 81Jul 03, 84[C21D]
4404047 Process for the improved heat treatment of steels using direct electrical resistance heatingExpiredDec 10, 80Sep 13, 83[C21D]
4224818 Method and apparatus for cold finishing of metalsExpiredSep 01, 78Sep 30, 80[B23B, B21C]

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