Google's 12.5 billion U.S. dollar purchase of Motorola Mobility in 2012 was widely seen as the company's strategy to boost its patent portfolio in its legal battle with rival Apple.

Under Google, the smartphone maker rolled out its Moto X and Moto G android smartphone alongside its existing Droid line, but still failed to swing back to profit. Motorola Mobility reported a loss of 249 million dollars in the third quarter of 2013, up 24 percent from the same period a year ago.

Antonio Wang, associate director of research firm IDC China, said the deal will bolster Lenovo's product research and development capabilities and the patent portfolio from Motorola Mobility will ease Lenovo's entry into new markets.

Lenovo became the world's largest PC maker in 2013 and is ramping up efforts to grow its mobile devices business. So far the Beijing-based company is the second biggest smartphone seller in China and comes in fourth in global smartphone sales, after Samsung, Apple and Huawei.

Of Lenovo's three major business lines -- PC, server and mobile devices -- both PC and server businesses have been successfully expanded on a global scale through a number of mergers and acquisitions. The purchase of Motorola Mobility marks an important milestone in Lenovo's long-term endeavor to enter the coveted U.S. and Latin America markets

"Through this deal Lenovo will have a truly global market for its mobile devices, establishing a foothold in markets where the company has yet to have a presence," said Kitty Fok managing director of IDC China.

Despite Motorola's dwindling market share in the smartphone business, estimated to be 1.1 percent of global smartphone shipment from the fourth quarter in 2012 to the third quarter in 2013, its close ties with major U.S. telecom operators such as AT&T, Verizon, Sprint and T-Mobile likely means bright prospects for Lenovo to expand in the U.S..