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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 |