DOVER CORPORATION (CANADA) LTD.
|DOVER CORPORATION (CANADA) LTD. Patent applications|
|Patent application number||Title||Published|
|20090279947||SUCKER ROD - An improvement in a sucker rod having an elongated metal body with opposed ends and threaded couplings positioned at each of the opposed ends comprises a thread form on the threaded couplings defining at least two concurrent helixes. Each of the at least two helixes has a different starting position on a circumference of the threaded coupling.||11-12-2009|