Lenovo will buy Motorola Mobility from Google for 2.9 billion U.S. dollars, in a bid to boost its smartphone business in the Americas and access thousands of patents, the Chinese company announced on Thursday.

Under the deal, Lenovo will pay 1.41 billion U.S. dollars in cash and its ordinary shares. The remaining 1.5 billion U.S. dollars will be paid over three years.

The announcement came about a week after Lenovo said it would buy IBM's low-end server business for 2.3 billion dollars. The company acquired IBM's thinkpad PC business in 2004 for 1.25 billion dollars.

The deal is still subject to regulatory review in the United States, but analysts say Lenovo's rising global profile and a number of cross-border deals in recent years will make it easier for the company to get the go-ahead from regulators in the U.S..

"The smartphone market is super competitive, and to thrive it helps to be all-in when it comes to making mobile devices. It's why we believe that Motorola will be better served by Lenovo, which has a rapidly growing smartphone business." Google's CEO Larry Page said in an online newsletter.

He added that Lenovo will keep the Motorola brand and "has the expertise and track record to scale Motorola into a major player within the Android ecosystem."

Shares of Google at NASDAQ gained 2.18 percent to 1,131 dollars in after-hours trading. Shares of Lenovo Group went through choppy trading in Hong Kong to close down 8.2 percent during the half-day trading on the eve of Chinese New Year.

Google will continue to hold the patents from Motorola Mobility after the deal, but will grant Lenovo license to access its patents.

"The move will boost Lenovo's smartphone business in North and Latin Americas while strengthening our market in west Europe so that they will be on par with the fast growth in emerging markets," Lenovo said in a statement.