From Adams v. Ford Motor Co., 2009 U.S. App. LEXIS 6460 (3d Cir. Mar. 26, 2009):

On May 27, 2008, the District Court entered an order declaring, inter alia, that "the Court finds that Vincent A. Colianni, Sr., [counsel for the plaintiff] has engaged in misconduct by his post-verdict communication with a juror in contravention of American Bar Association Model Rule of Professional Conduct 3.5(c)." ... We assume[] without deciding for present purposes that the entry of this order constituted an imposition of a sanction. Colianni filed a notice of appeal from this order on May 29, 2008.

***

[No Interlocutory Appeal of Sanctions Order]

Our decision in Comuso v. Nat'l R.R. Passenger Corp., 267 F.3d 331 (3d Cir. 2001), dictates our response to the issues thus posed. *** In Comuso, the District Court found Marvin Barish, counsel for the plaintiff, guilty of seriously unprofessional conduct directed towards opposing counsel during a recess. The Court imposed the following sanctions on Barish pursuant to its inherent authority to discipline attorneys practicing before it: disqualification from continued representation in the case, a monetary sanction of $ 13,285, and a referral to the Disciplinary Board of the Supreme Court of Pennsylvania. This Court held in Barish's immediate appeal that it had no jurisdiction.

Barish insisted that the order sanctioning him raised an important issue distinct from the merits of the case and would be effectively unreviewable on appeal from a final judgment. Although we recognized that counsel had a significant interest in personal vindication distinct from the interests of his client, we nonetheless rejected both contentions:

[T]he Supreme Court has consistently rejected a case-by-case approach in deciding whether an order was separate from the merits of the litigation in favor of a per se rule that sanctions orders are inextricably intertwined with the merits of the case. See Cunningham, 527 U.S. at 206, 119 S. Ct. 1915; Richardson-Merrell, 472 U.S. at 439, 105 S. Ct. 2757. Therefore, we hold that the District Court's order imposing sanctions against Barish is not sufficiently separate from the underlying merits of the case.

Moreover, we note that denying jurisdiction now does not prevent appellate review of the sanctions in an appeal of the final judgment on the merits. The fact that Barish is no longer part of the litigation does not make the sanctions order immediately appealable. . . . That Barish may have to monitor the progress of the litigation in order to appeal upon final judgment is not dispositive. See Cunningham, 527 U.S. at 209, 119 S. Ct. 1915. Therefore, the order imposing sanctions on Marvin Barish is not immediately appealable under 28 U.S.C. § 1291.

Comuso, 267 F.3d at 339. As in Comuso, the District Court's sanction order here was not immediately appealable under the collateral order doctrine.

[Premature Appeal of Sanctions Order Not Revived by Subsequent Entry of Judgment]

The District Court entered a final order on the merits of this case on August 20, 2008. Colianni did not file an appeal of the sanction order within thirty days of the entry of that final order. Accordingly, the remaining jurisdictional issue is whether the entry of the final judgment revived the premature notice of appeal filed on May 29, 2008. We conclude that it did not.

Federal Rule of Appellate Procedure 4(a)(2) provides that under certain circumstances a premature appeal followed by the entry of a final merits judgment shall be treated as filed on the date of the judgment. As we know from the teachings of FirsTier Mortgage Co. v. Investors Mortgage Ins. Co., 498 U.S. 269 (1991), however, this "is not to say that Rule 4(a)(2) permits a notice of appeal from a clearly interlocutory decision — such as a discovery ruling or a sanctions order under Rule 11 of the Federal Rules of Civil Procedure — to serve as a notice of appeal from a final judgment. A belief that such a decision is a final judgment would not be reasonable." Id. at 276 (emphasis in original). Thus, Rule 4(a)(2) does not help Colianni here.

Rule 4(a)(2) is not the only authorization recognized by our Circuit for treating a premature notice of appeal as an appeal from a subsequently entered final judgment. See, e.g., Cape May Greene, Inc. v. Warren, 698 F.2d 179 (3d Cir. 1983); Lazy Oil Co. v. Witco Corp., 166 F.3d 581 (3d Cir. 1999). We have held, however, that the doctrine reflected in this line of cases does not authorize permitting a premature notice of appeal from a clearly interlocutory order such as a sanction order to ripen upon the entry of a final judgment on the merits. ADAPT of Philadelphia v. Philadelphia Housing Auth., 433 F.3d 353 (3d Cir. 2006); Lazorko v. Pennsylvania Hosp., 237 F.3d 242 (3d Cir. 2000).