Perma Life Mufflers, Inc. v. International Parts Corp.’s Empirical Analysis
1968
Citation profile
658 federal appellate · 206 district · 75 state decisions
How this case has been cited
Cited by 1,582 later decisions (75 by the Supreme Court) — most recently May 2025 · most notably Mitsubishi Motors Corporation v. Soler Chrysler-Plymouth Inc Soler Chrysler-Plymouth Inc (1985), Brunswick Corporation v. Pueblo Bowl-O-Mat Inc (1977)
658 federal appellate · 206 district · 75 state decisions — followed in 14 states
Later decisions citing this case, by decade. The current decade is in progress, and our corpus holds fewer opinions from the most recent years, so the latest bars are undercounted — not a real decline.
Appellate journey
reviewedPerma Life Mufflers, Inc. v. International Parts Corp. (from Seventh Circuit Court of Appeals)
Relationships
Applies 15 U.S.C. § 1 (§ 1 of the Sherman Antitrust Act) · 15 U.S.C. § 13 (§ 2 of the Clayton Antitrust Act of 1914) · 15 U.S.C. § 14 (§ 3 of the Clayton Antitrust Act of 1914) · 15 U.S.C. § 15 (§ 4 of the Clayton Antitrust Act of 1914)
Relies on Bigelow v. RKO Radio Pictures, Inc. · Continental Ore Company v. Union Carbide and Carbon Corporation · Eastman Kodak Co of New York v. Southern Photo Materials Co · Kiefer-Stewart Co. v. Joseph E. Seagram & Sons, Inc.
Cited together with Kiefer-Stewart Co. v. Joseph E. Seagram & Sons, Inc. · Zenith Radio Corp. v. Hazeltine Research, Inc. · Poller v. Columbia Broadcasting System, Inc. · Northern Pacific Railway Co. v. United States · Brunswick Corporation v. Pueblo Bowl-O-Mat Inc
Most-quoted passages
The sentences later courts lift from this opinion, ranked by how many decisions quote each — the parts of the opinion doing the work. These counts are smaller than the citation total above because most of the 1,582 citing decisions cite the case generally; a passage count includes only decisions quoting that exact language verbatim.
“the doctrine of in pari delicto, with its complex scope, contents, and effects, is not to be recognized as a defense to an antitrust action.”
77 later decisions quote this exact passage · from the majority“Generally speaking, ... I would deny recovery where plaintiff and defendant bear substantially equal responsibility for injury to one of them ....”
11 later decisions quote this exact passage · from the concurrence“(S) ince respondents Midas and International availed themselves of the privilege of doing business through separate corporations, the fact of common ownership could not save them from any of the obligations that the law imposes on separate entities.”
7 later decisions quote this exact passage · from the majority
How this case has been treated — in progress
Whether each later court followed, distinguished, criticized, or overruled this decision. The treatment classification (task #35) runs highest-cited cases first and lights up here as it reaches this one.