Blackberry has been winning market share from Motorola
Motorola has asked US regulators to ban Research in Motion (RIM), the Canadian firm behind the Blackberry, from importing its products into the US.
The phone company claims that the Blackberry maker has been illegally using its wi-fi related technology.
A court case is already pending in the US but Motorola has accused RIM of "delaying tactics".
Motorola has lodged its complaint with the US International Trade Commission (ITC) in the hope of a quicker result.
"Motorola has no choice but to file a complaint with the ITC to halt RIM's continued infringement" said Motorola's legal representative, Jonathan Meyer.
The ITC typically takes about a month to decide whether to launch an investigation, which takes 12 to 14 months to complete. It can't award damages but it can stop products from being shipped into the US.
The complaint stems from the two companies failing to renew a cross-licensing agreement.
"These patented technologies are important to Motorola as they allow for more comprehensive connectivity, a better user experience and lower product costs," Motorola said in its statement.
Research In Motion declined to comment on the case.