The case before the court concerned arbitrary employment decisions that do not involve race, gender or other categories that are explicitly protected by federal law.

Individual public employees typically have a variety of protections from personnel actions, but invoking the equal protection clause of the Constitution is not one of them, Chief Justice John Roberts said in his majority opinion.

The court's 6-3 decision in the case from Oregon was one of four opinions handed down Monday as the justices race to complete their work before their customary summer break begins in late June. Twenty-two cases remain to be decided and more opinions are expected Thursday.

Major cases still undecided include the rights of detainees at Guantanamo Bay, the ban on handguns in Washington, D.C., and whether people convicted of raping children can be given the death penalty.

The unanimous decision came in a case involving the federal Racketeer Influenced and Corrupt Organizations Act.

The court ruled in favor of two firms alleging that manipulation by competitors had resulted in a disproportionate share of tens of thousands of tax liens going to the competitors.

Tax sales in Cook County enable the collection of unpaid property taxes, giving buyers of tax liens an opportunity to take over property if the owners don't pay up.

The issue for Phoenix Bond & Indemnity Co. and BCS Services Inc. was whether they could sue even though they had not relied on allegedly fraudulent statements the defendants submitted to Cook County. The statements said that each tax buyer was truly independent from other tax buyers in the competitive bidding.

Writing for the court, Justice Clarence Thomas said that nothing in the RICO law required Phoenix and BCS to show that they relied on alleged misrepresentations by a defendant.

Cook County requires that each buyer submit bids only in its name and not through any related entity.

Phoenix and BCS alleged that a number of related entities "packed the room" in tax sales by having relatives in two families bid for the same properties.

The unanimous decision Monday was helpful to customers of Intel Corp. and is the latest step by the justices to scale back the power of patent-holders.

The case revolves around a long-time Supreme Court doctrine that says the sale of an invention exhausts the patent-holder's right to control how the purchaser uses it.

In 1992, a federal appeals court in Washington, D.C., that hears patent cases from around the country began eroding the doctrine, ruling that patent-holders could attach post-sale conditions to patented products.

Justice Clarence Thomas reined in the appeals court, saying that "for over 150 years the Supreme Court has applied the doctrine of patent exhaustion" and that it applies in this case.

In the case before the Supreme Court, a South Korean company, LG Electronics Inc., licensed some of its patents to Intel Corp.

LG then sued some of Intel's customers for patent infringement, saying they owed royalties to LG because the customers combined Intel's microprocessors and chipsets with non-Intel products.

Patent laws can carry triple-damage awards when a court finds willful infringement.

The Intel customers are computer system manufacturers that include Taiwan-based Quanta Computer Inc. System manufacturers sell to industry brandnames such as Dell Inc., Hewlett-Packard Co., International Business Machines Corp. and Gateway Inc.

The Bush administration supported Intel's customers. It cited inconvenience, annoyance and inefficiency of multiple royalty payments being passed down the chain of distribution with no obvious stopping point.

Friday's decision is a victory for Janet Jenkins, who entered a civil union with Lisa Miller in Vermont in 2000. Two years later, Miller gave birth to a daughter conceived through artificial insemination. The women later split up, and their civil union was dissolved.

A Vermont judge awarded custody of their 5-year-old daughter to Miller, with regular visitation for Jenkins.

Miller and the child now live in Winchester, Virginia. Jenkins has been fighting for child visitation rights, but Miller has contested those efforts.

The Virginia Supreme Court rejected Lisa Miller's claim that a lower court improperly ignored a Virginia law and a state constitutional amendment that prohibit same-sex unions and the recognition of such arrangements from other states.

The ruling was a victory for Janet Jenkins, who has been fighting for visitation rights since the dissolution of the civil union she and Miller obtained in Vermont in 2000. In 2002, Miller gave birth to the daughter, Isabella, who now is at the center of a legal battle closely watched by national conservative and gay rights groups.

Miller renounced homosexuality and moved back to Virginia with the child after the couple split, and she has fought Jenkins' visitation efforts. However, the Supreme Court ruled that a federal law aimed at preventing parents from crossing state lines to evade a custody ruling requires Virginia to enforce Vermont's order.

Conservative religious and legal groups had asked the California Supreme Court to stop its May 15 order requiring state and local officials to sanction same-sex unions from becoming effective until voters have the chance to consider the issue in November. The justices' decisions typically become final after 30 days.

An initiative to ban gay marriage has qualified for the Nov. 4 ballot. Its passage would overrule the court's decision by amending the state constitution to limit marriage to a man and a woman.

In arguing for a delay, the amendment's sponsors predicted chaos if couples married in the next few months, only to have the practice halted at the ballot box.

The four justices who denied the stay request were the same judges who joined in the majority opinion that found withholding marriage from same-sex couples constituted discrimination. The three dissenting justices said they thought a hearing on whether the stay should be granted was warranted.

The majority did not elaborate on its reasons for denying the stay, but simply issued a one-page order saying its original ruling on marriage would be final at 5 p.m. on June 16.

Wednesday's denial clears the way for gay couples in the nation's most populous state to get married starting June 17, when state officials have said counties must start issuing new gender-neutral marriage licenses.