BOISE - Chip maker Micron Technology Inc. said Wednesday it will appeal a jury's finding that chip designer Rambus Inc. did not break antitrust or patent law in its chip development.

The jury's finding in U.S District Court for the Northern District of California in San Jose follows a long-running legal dispute between Rambus and a group of chip makers.

Rambus said in court that some of its chip designs were used without its permission by Micron and fellow memory chip manufacturers Hynix Semiconductor and Nanya Technology.

Micron and the others argued in court that Rambus violated antitrust laws by trying to monopolize six technology markets. They accused Rambus of using patent claims to monopolize designs that were already being used in the industry.

Rambus shares soared $7.25 or 39 percent to close at $25.86 after the jury decision was announced, hitting a nearly two-year high during the session of $26.30. In aftermarket electronic trading, shares rose a further $1.07, or 4.1 percent, to $26.93.

Micron shares fell 29 cents, or 5 percent, to close at $5.50 and during the session hit $5.43, their lowest point since early 1994, during the session. Share gained a penny in aftermarket trading.