Also

* Federal regulators approved the $1.8-billion purchase by Shell Oil Co. of Pennzoil Quaker State Co., the nation’s largest motor oil maker and parent of the Jiffy Lube service stations.

* A judge agreed to appoint a trustee in Napster Inc.’s bankruptcy case after a request to convert the defunct Internet music-swapping site’s case to a Chapter 7 liquidation was withdrawn because an undisclosed buyer agreed to purchase some of the company’s assets.

* Unocal Corp. said it will take a charge for third-quarter environmental clean-up costs of $22 million, or 9 cents a share. The provision will lower third-quarter earnings to 35 cents to 45 cents a share, the El Segundo-based company said.

* Boeing Co. won a $542.3-million Air Force contract for maintenance work and spare parts on the C-17 military transport plane.