Microsoft has claimed that the Android OS infringes on intellectual property.

This post has been updated.

Microsoft's Android patent-licensing streak continues. Marking the fourth agreement in nine days, the latest company to sign with the Redmond software giant is Wistron, a Taiwanese original design manufacturer.

Wistron doesn't have its own brand, rather it produces products for customers -- a.k.a. OEMs or original equipment manufacturers -- which means that this deal could be a particularly large one for Microsoft. The patent agreement covers any of Wistron's tablets, mobile phones, e-readers and other devices running the Android or Chrome platform.

The claim to Chrome is a new one -- previous deals covered only the Android OS -- and could signal a new direction for Microsoft.

As with the last few deals, the terms of the agreement weren't disclosed. Walter Pritchard, a Citi analyst, estimates that Microsoft is seeking royalties ranging from $7.50 and $12.50 from other manufacturers. HTC, which signed a similar deal with Microsoft last year, pays an estimated $5 per device.

Last week, Microsoft announced that three companies also had signed licensing deals: military subcontractor General Dynamics, custom PC-manufacturer Velocity Micro and Onkyo.

Microsoft also recently sued Barnes & Nobles, citing patent infringement by the retailer's Android-based Nook e-reader.

Microsoft has been busy in the realm of intellectual property, racking up 700 patent licensing agreements since December 2003.