No details were released on the amount of the transaction.
The patents relate to a technology that permits virtual images to be super-imposed over real ones, according to media reports.
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They could be used in the interactive voice-activated eyewear being developed by the US Internet giant. A prototype is currently in testing.
Foxconn Technology, also known under the name Hon Hai Precision Industry, is the main supplier in Asia for Google's biggest rival Apple, particularly for the manufacture of iPhones.