WASHINGTON (AP) — The Supreme Court sided Monday with an Alabama technology company over the U.S. Postal Service in a patent dispute.

The dispute before the justices had to do with U.S. Patent No. 6,826,548. That's the patent Birmingham-based Return Mail has for a system that uses barcodes, scanning equipment and computer databases to process returned mail almost entirely automatically. The Postal Service initially expressed interest in Return Mail's invention but ultimately developed its own, similar system. That led to a dispute over the company's patent.

On Monday, the court sided 6-3 with Return Mail. Of the Postal Service's arguments, Justice Sonia Sotomayor deadpanned in an opinion : "None delivers."

The dispute began when the Postal Service tried and failed to get Return Mail's patent invalidated. Return Mail sued, arguing that the government should pay for using its invention without permission.

Just as Return Mail thought it might be gaining the upper hand, the Postal Service switched tactics, using a 2011 law to challenge Return Mail's patent. The Leahy-Smith America Invents Act says that a "person who is not the owner of a patent," can file a patent challenge using the law. The Postal Service argued it counted as a "person" under the law, but the Supreme Court disagreed.

The case is Return Mail v. USPS, 17-1594.

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