LINCOLN, Neb. (AP) -- Prism Technologies is suing five cell phone makers for allegedly using its patent-protected computer technology without permission.
The lawsuits in U.S. District Court of Nebraska were filed against AT&T Inc., Verizon Wireless, T-Mobile USA, Sprint PCS and U.S. Cellular.
Verizon Wireless is part of Verizon Communications Inc. and Sprint PCS is part of Sprint Nextel Corp.
Prism alleges that the companies took advantage of a system that controls which smart phones, tablets and broadband mobile cards can access an internet service.
The lawsuit says the company secured a patent for its inventions in October 2007. The company is seeking royalty payments with interest, as well as a judge's order for the companies to stop the alleged violation.