It is contended that the court erred in concluding that the judgment entered by the Court for Western Oklahoma dismissing Steel from the action pending in that court constituted a. bar to the maintaining of this action. The general principles of res judicata and estoppel by judgment have been clearly blueprinted. It is the rule of long standing and frequent repetition that where a second suit between the same parties, or their privies, is on the same cause of action, the final judgment in the prior action is conclusive as to all matters which were actually litigated and as to every issue, claim, or defense which might have been presented; and that where the later suit is upon a different cause of action, the judgment in the former operates as an estoppel only in respect to the issues and questions which were actually litigated and determined. Cromwell v. County of Sac, 94 U.S. *351, 24* L.Ed. 195; Southern Pacific Railroad Co. v. United States, 168 U.S. 1, 48, 18 S.Ct. 18, 42 L.Ed. 855; Commissioner of Internal Revenue v. Sunnen, 333 U.S. 591, 68 S.Ct. 715, 92 L.Ed. 898; United States v. Munsingwear, Inc., 340 U.S. 36, 71 S.Ct. 104, 95 L.Ed. 36; United States v. International Building Co., 345 U.S. 502, 73 S.Ct. 807, 97 L.Ed. 1182; Happy Elevator No. 2 v. Osage Construction Co., 10 Cir., 209 F.2d 459; First National Bank in Wichita v. Luther, 10 Cir., 217 F.2d 262. Providential and Steel were parties to the former action and they were parties to this one. The liability of Steel arising out of the asserted manufacture and sale of defective pipe was an issue in the former action and it was an issue in this one. In the former action, the issue was tendered both in the amended complaint of Summers and in the cross complaint of Providential, and in this action ■ it was tendered in the complaint. It is manifest that as between Providential and Steel there were in. the two actions identity of parties and identity of issues in respect to the liability of Steel based-upon the asserted manufacture and sale of defective pipe.
Providential urges however that in the Court for Western Oklahoma there was no trial on the merits joined between the present litigants and therefore the judgment entered in that court in favor of Steel did not constitute res judicata here. Neither the amended complaint of Summers nor the cross complaint of Providential was dismissed or stricken in whole or in part on demurrer, motion, or other like preliminary pleading. The tendered issue of liability on the part of Steel based upon asserted manufacture and sale of defective pipe was not eliminated from that case upon any preliminary, subsidiary, or technical plea or objection. The issue was joined when the case went to trial and it was judicially determined on its merits by entry of the judgment dismissing the action as to Steel. A final judgment of a court of competent jurisdiction upon the merits concludes the parties to the litigation and their privies even though the court may have been mistaken as to the facts, or may have misconceived the law. And the word “merits” in the sense used means the real or substantial grounds of action or defense as distinguished from matters of practice, procedure, or form. Clegg v. United States, 10 Cir., 112 F.2d 886. Viewed in the light of that general rule, it is clear that the judgment entered in the Court for Western Oklahoma was on the merits joined between the present litigants, even though it may have been entered prematurely or was otherwise burdened with procedural error.
Providential advances the further contention that the defense of res judicata was not available to Steel for the reason that there had been a change of condition since the entry of the judgment in the Court for Western Oklahoma dismissing the action as to Steel. The argument in support of the contention is that there had been an intervening decision in the case in Western Oklahoma determining that Providential was indebted to Summers as the result of furnishing defective pipe for use in the well. It was recently held in effect that the general