LOUISVILLE LADDER CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5317798 Method of manufacturing box laddersExpiredMar 10, 92Jun 07, 94[B23P]
4974701 Step ladder constructionExpiredNov 27, 89Dec 04, 90[E06C]
4519478 Ladder extension couplingExpiredMay 17, 84May 28, 85[E06C]
4216766 Treatment of body tissue by means of internal cavity resonanceExpiredSep 07, 79Aug 12, 80[A61B]

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