Legal Opinion

Precision Instrument Manufacturing Co. v. Automotive Maintenance MacHinery Co.

Supreme Court of the United States

Decided April 23, 1945No. 377PublishedCited by 982 opinions

1Opinion of the CourtJustice Murphy

The respondent, Automotive Maintenance Machinery-Company, charged in two suits that the various petitioners had infringed three patents owned by it relating to torque wrenches. It was further asserted that the allegedly infringing acts also breached several contracts related to the patents. In defense, the petitioners claimed inter alia that Automotive possessed such “unclean hands” as to foreclose its right to enforce the patents and the contracts.

The District Court, at the close of a consolidated trial on the sole issue of Automotive’s alleged inequitable conduct, delivered an oral opinion…

2Cases cited9 opinions

  1. Hazel-Atlas Glass Co. v. Hartford-Empire Co.Supreme Court of the United States · 1944
  2. Keystone Driller Co. v. General Excavator Co.Supreme Court of the United States · 1933
  3. Mercoid Corp. v. Mid-Continent Investment Co.Supreme Court of the United States · 1944
  4. Morton Salt Co. v. G. S. Suppiger Co.Supreme Court of the United States · 1942
  5. Loughran v. LoughranSupreme Court of the United States · 1934

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3Cited by982 opinions

  1. Blonder-Tongue Laboratories, Inc. v. University of Illinois FoundationSupreme Court of the United States · 1971
  2. Walker Process Equipment, Inc. v. Food MacHinery & Chemical Corp.Supreme Court of the United States · 1965
  3. Trump v. J. G. G.Supreme Court of the United States · 2025
  4. JPMorgan Chase Bank, N.A. v. WingetCourt of Appeals for the Sixth Circuit · 2007
  5. Kingsdown Medical Consultants, Ltd. And E.R. Squibb & Sons, Inc. v. Hollister IncorporatedCourt of Appeals for the Federal Circuit · 1988

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