Wis. Stat. § 893.02
Except as provided in s. 893.415(3) , an action is commenced, within the meaning of any provision of law which limits the time for the commencement of an action, as to each defendant, when the summons naming the defendant and the complaint are filed with the court, but no action shall be deemed commenced as to any defendant upon whom service of authenticated copies of the summons and complaint has not been made within 90 days after filing.
Wis. Stat. § 893.02
In a products liability action, a new cause of action for punitive damages brought after the statute of limitations expired related back to the date of filing the original pleading. Wussow v. Commercial Mechanisms, Inc., 97 Wis. 2d 136, 293 N.W.2d 897 (1980). An action against an unnamed defendant under s. 807.12 that was filed on the last day of a limitation period, in which amended process naming the defendant was served within 60 days after filing, was not time barred. The relation back requirements of s. 802.09(3) were inapplicable. Lak v. Richardson-Merrell, Inc., 100 Wis. 2d 641, 302 N.W.2d 483 (1981). Service of process did not commence an action when the plaintiff failed to file the summons and complaint. The defendant's answer did not waive the statute of limitations defense or estop the defendant from raising it after the limitation period expired. Hester v. Williams, 117 Wis. 2d 634, 345 N.W.2d 426 (1984). A fictitiously designated defendant's right to extinction of an action does not effectively vest until 60 days after the statute of limitations runs. Lavine v. Hartford Accident & Indemnity Co., 140 Wis. 2d 434, 410 N.W.2d 623 (Ct. App. 1987). Timely Service Abroad in Diversity Suits. La Fave. Wis. Law. Nov. 2000.