Google has acquired 187 patents and 36 applications, adding to the 1,000 it purchased from IBM in September 2011 in a move to protect its Android mobile operating system from competitors' patent lawsuits.
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The cost of Google’s intellectual property spending spree runs into billions of dollars, having also purchased hardware manufacturer Motorola Mobility earlier in 2011 for $12.5bn (£7.7bn).
The deal included 24,500 patents, many of which could be used to defend features on its Android mobile operating system.
The latest patents include a method for using web-based applications across additional devices, a computer phone and a US patent that relates to social networking sites, allowing "identifying common interests between users of a communication network", according to the BBC.
Analysts say the latest patent acquisitions indicate Google is no longer playing catch-up and is now in a stronger position.