TI filed the suit Tuesday under seal at a Delaware Chancery Court--in the same jurisdiction Qualcomm used to file a lawsuit against TI in July.
The legal tug-of-war is over abetween the two companies. That agreement let both companies use many of each other's cell phone patents in their products. The pact let each company "develop a semiconductor that infringed" patents and sell it without being sued, Qualcomm General Counsel Lou Lupin said in an .
A Qualcomm representative declined to comment Tuesday.
Earlier, Qualcomm accused TI of disclosing information publicly that was to be confidential under terms of the agreement. Neither Lupin nor the Newcastle County, Del., Superior Court lawsuit provided additional details about what TI allegedly disclosed.
TI fired back with its suit, saying it learned from customers that Qualcomm has been offering handset makers discounts on the fees they must pay to license the company'scell phone technology. That breaches the contract as well, according to a statement from TI.
The suit does not name which handset makers were offered discounts. Many of the world's major handset makers have licensed Qualcomm's cell phone technology.