Huawei has filed a lawsuit against Motorola in a bid to stop the handset firm passing on intellectual property to Nokia Siemens Networks (NSN).
The US district court filing comes as NSN is on the verge of acquiring Motorola's wireless network business for $1.2bn (£750m).
Huwaei claimed in the 33-page document that Motorola is obligated to maintain the secrecy of confidential information provided under certain agreements.
"Now, however, Motorola intends to transfer its wireless infrastructure business, including its UMTS and GSM business, to NSN which competes directly with Huawei," the filing said.
"Such a transfer, if consummated in its originally contemplated form, will result in the massive disclosure of Huawei's confidential information to NSN, with irreparable harm to Huawei."
Huawei is looking to protect devices such as the Ideos smartphone, a budget device that was among the first to ship with Android 2.0.
V3.co.uk contacted Motorola for comment, but the firm had not responded at the time of publication.
Motorola had previously filed a complaint in a federal court in Chicago accusing Huawei of knowingly receiving stolen information from a Motorola employee.
The company has alleged that a former engineer had emailed Huawei founder Ren Zhengfei with information about a new transceiver and other technologies, and claimed that it has emails proving that the dialogue took place.
Huawei dismissed the accusations as "groundless and utterly without merit".
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