A federal judge canceled a scheduled June 11 trial between Apple Inc and Google Inc's Motorola Mobility unit over patents related to mobile phones and tablet computers, and expects to dismiss the case because neither can prove damages.

In a "tentative" order, U.S. Circuit Judge Richard Posner in Chicago on Thursday said each company's case should be dismissed with prejudice, meaning it cannot be brought up again.

He said neither Apple nor Motorola Mobility had enough admissible evidence of damages to withstand dismissal.

Posner also said to grant injunctions against infringements "would impose costs disproportionate to the harm to the patentee and the benefit of the alleged infringement to the alleged infringer and would be contrary to the public interest."

The judge said he expects to more fully explain his reasoning in a written opinion within one week. Posner normally handles appeals, rather than cases in trial court.

"We are pleased by the Illinois trial court's tentative ruling today dismissing Apple's patent claims and look forward to receiving the full decision," Google said in a statement.

Apple declined to comment.

The trial, which would have been before a jury, would have been the first between the companies since Google last month bought Motorola Mobility for $12.5 billion.

It is one of many lawsuits worldwide pitting Apple, whose iPhone is the world's most popular smartphone, against Motorola Mobility, whose parent produces the Android operating system.

In 2012, the iPhone is expected to capture more than 20 percent of the global smartphone market, while 61 percent of smartphones will use the Android system, International Data Corp said on Wednesday.

Apple had sued Motorola Mobility for alleged infringements of four patents, but a May 22 ruling by Posner scuttled its damages claims on two of those patents. Motorola Mobility had sued over one patent.

Apple is based in Cupertino, California, and Google is based in Mountain View, California.

The case is Apple Inc et al v. Motorola Inc et al, U.S. District Court, Northern District of Illinois, No. 11-08540.