OPINION
Aрpellant, Rosie Riston, appeals a summary judgment dismissing her personal injury claims against appellee, John Doe # 1 a/k/a ThyssenKrupp Elevator Corporation d/b/a ThyssenKrupp Elevator d/b/a Dover Elevator d/b/a Dover Elevator Company d/b/a Dovep (“ThyssenKrupp”), bаsed on the statute of limitations. We affirm.
I. Background
Riston claims she was injured on September 23, 2000 when she was struck by an elevator door at Houston Intercontinental Airport. She originally sued the City of Houston only. However, she filed a first amended petition on September 22, 2002 adding “John Doe # 1,” “John Doе # 2,” “John Doe # 3,” “John Doe # 4,” and “John Doe #5” as defendants. Riston alleged that these defendants designed, manufactured, sold, installed, built and/or maintained the elevator. She asserted causes of action for negligence, product liability, breach of warranties, and strict liability. On September 25, 2002, Riston filed a second amended petition naming “John Doe # 1 a/k/a ThyssenKrupp Elevator Corporation d/b/a ThyssenKrupp Elevator d/b/a Dover Elevator d/b/a Dover Elevator Company d/b/a Dover” in place of “John Doe # 1.” 1 ThyssenKrupp was served on October 25, 2002. 2
ThyssenKrupp moved for summary judgment asserting that (1) Riston did not file suit against ThyssenKrupp within the two-year statute of limitations, and (2) Ri-ston could not assert breach ’ of warranty claims against ThyssenKrupp because it did not design, manufacture, market, sell, or install the elevator. 3 The trial court *527 granted the motion for summary judgment, dismissed all Riston’s claims against ThyssenKrupp, and severed the claims against Thyssenkrupp from the remaining claims.
II. Standard of Review
When a defendant moves for summary judgment on the basis of an affirmative defense such as limitations, it has the burden to conclusively prove all the elements of the affirmative defense as a matter of law.
KPMG Peat Marwick v. Harrison County Hous. Fin. Corp.,
III. Statute of Limitations
In her sole issue, Riston contends the trial court erred by granting Thyssen-Krupp’s motion for summary judgment because the statute of limitations was tolled based on the doctrines of misnomer, due diligence, and relation back. 4 Riston does notdispute that she first named Thyssen-Krupp as a defendant in her second amended petition, filed after the statute of limitations expired. See Tex. CIv. Prac. & Rem.Code Ann. § 16.003(a) (Vernon 1986) (prescribing two-yеar statute of limitations for personal injury claims). However, Ri-ston contends her timely first amended petition naming “John Doe # 1” tolled the statute of limitations because “John Doe # 1” was a misnomer for ThyssenKrupp. Riston further contends that she tolled the statute of limitations because shе used due diligence to serve ThyssenKrupp, and, therefore, the date of service related back to the filing of her timely first amended petition.
This case presents an issue of first impression in Texas. The parties do not cite, and we have not found, any Texas law addressing the usе of a “John Doe” petition to toll the statute of limitations, except where specifically authorized by statute. However, for the reasons stated below, we refuse to allow Riston’s “John Doe” petition to toll the statute of limitations. 5
*528 A. The Misnomer Doctrine Does Not Aрply To A “John Doe” Petition.
First, the misnomer doctrine is not applicable here. Misnomer arises when the plaintiff merely misnames the correct defendant.
Chilkewitz v. Hyson,
However, “John Doe” is not a misnomer for any person or entity.
See Grantham v. Blount, Inc.,
B. A “John Doe” Petition Does Not Toll Limitations As To An Unknown Defendаnt.
Because “John Doe” was not a misnomer for ThyssenKrupp or any other defendant, Riston named an unknown defendant. ThyssenKrupp asserts that a petition which fails to identify the defendant does not toll limitations. We agree for several reasons.
1. No Texas Statute Generally Authоrizes A “John Doe” Petition To Toll Limitations As To An Unknown Defendant.
The Texas Legislature has not generally authorized a plaintiff to initiate suit and toll limitations by suing an unknown defendant as “John Doe” or any other fictitious name.
See Maury v. Turner,
2. In Deciding If Limitations Has Tolled, A “John Doe” Petition Should Be TReated The Same As A Petition Involving A Misidentification.
Further, although a “John Doe” petition involves an unknown defendant, for limitations purposes, it should be treated the same as a рetition involving misidentification. Misidentification is distinct from misnomer.
Enserch Corp.,
*530 3. Policy Reasons Why A “John Doe” Petition Should Not Toll Limitations Unless Authorized By Statute.
Finally, statutes of limitations would have little, if any, import if they could easily be circumvented by filing a “John Doe” petition.
See Thomas v. Process Equip. Corp.,
In sum, Riston’s “John Doe” petition did not toll the statute of limitations as to ThyssenKrupp. Accordingly, Riston did not file suit against ThyssenKrupp before limitations expired.
C.. The Due Diligence and Relation Back Doctrines Are Inapplicable.
Riston also asserts the statute of limitations was tolled under the doctrines of due diligence and relation back. A plaintiff must file suit and effect service before limitations expires.
Brown v. Shores,
*531 IV. Conclusion
Because Riston did not file suit against ThyssenKrupp before the statute of limitations expired, the trial court did not err in granting ThyssenKrupр’s motion for summary judgment and dismissing Riston’s claims against ThyssenKrupp. Riston’s sole issue is overruled.
The judgment of the trial court is affirmed.
Notes
. Riston subsequently amended her petition again to name "John Doe # 2 a/k/a Montgomery Elevator Company a/k/a Montgomery Elevator Operating Company n/k/a Kone, Inc. d/b/a Montgomery Elevator” in place of "John Doe # 2.”
. Riston asserts that ThyssenKrupp's agent refused to accept service. The record reflects that a company that handles service of process returned two citations to Riston's attorney because the names of the defendаnts on the citations did not match the names on file with the Secretary of State. Nevertheless, in its brief, ThyssenKrupp acknowledges that it was served on October 25, 2002, and Thyssen-Krupp subsequently answered the suit.
.ThyssenKrupp originally moved for summary judgment based on the statute of limitations only. Riston resрonded that the two-year statute of limitations was tolled based on *527 the doctrines of misnomer, relation back, and due diligence. She also responded that her breach of warranty claims were governed by the four-year statute of limitations. Subsequently, ThyssenKrupp filed an amеnded motion for summary judgment again asserting the statute of limitations but also challenging the merits of Riston’s breach of warranty claims.
. On appeal, Riston does not challenge the summary judgment on the breach of warranty claims. She addresses only the summary judgment on the claims governed by the two-year statute of limitations. Therefore, we will not address the summary judgment on the breach of warranty claims.
See Jacobs v. Satterwhite,
. Although an issue of first impression in Tеxas, several states have refused to allow “John Doe” petitions to toll limitations.
See, e.g., Grantham v. Blount, Inc.,
. "John Doe” is also used to protect a person’s known identity or indicate that a true defendant does not exist. See Black’s Law Dictionary 845. However, neither of these definitions is applicable here.
. In fact, Riston's timely petition reflects she did not know the identities of the "John Doe” defendants because she stated, "Plaintiff has timely requested the City of Houston to provide the identity of such Defendants so that they may be properly served.”
. Section 16.0045 further provides that the person filing the petition shall proceed with due diligence to discover the identity of the defendant and amend the petition by substituting the real name of the defendant for "John or Jane Doe” not later than the 30th day after the date that the defendant is identified to the plaintiff. Tex. Civ. Prac. & Rem.Code Ann. § 16.0045. The limitations period begins running again on the date that the petition is amended. Id.
. However, even in cases of misidentification, limitations may be tolled when a plaintiff sues an incorrect entity if (1) there are two separate but related entities that use a similar trade name, (2) the correct entity had notice of the suit, and (3) the correct entity was not misled or disadvantaged by the mistake.
Wright v. Tex. Dept. of Criminal Justice-Institutional Div.,
.Here, there is no evidence that Thyssen-Krupp was served with, or otherwise put on notice of, Riston’s suit before limitations expired.
