Cardinal Tank Corp.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4883626 Method of molding a manhole frame for spherical tanksExpiredNov 21, 88Nov 28, 89[B28B, B29C]
4818211 Die system for making manhole frame for spherical tanksExpiredMar 24, 87Apr 04, 89[B29C]

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