opinion: STANDARD INDUSTRIES, INC. v. TIGRETT INDUSTRIES, INC., et al.
  No. 445.
  Argued March 2, 1970
  Decided April 20, 1970
  I. Walton Bader argued the cause for petitioner. With him on the briefs was Maximilian Bader.
  Ralph W. Kalish argued the cause and filed a brief for respondents.
  Lawrence G. Wallace argued the cause for the United States as amicus curiae urging reversal. With him on the brief were Solicitor General Griswold, Assistant Attorney General McLaren, and Richard H. Stern.
  Sidney Neuman argued the cause for the American Patent Law Association as amicus curiae. On the brief were Frank L. Neuhauser, John F. Witherspoon, Robert E. LeBlanc, William L. Mathis, and Henry Shur.
  Per Curiam.
  The judgments are affirmed by an equally divided Court.