Non-Practicing Entities' WiFi Litigation

There are several NPE's that sue other firms for patent infringement through the usage of WiFi-compliant devices.

Innovatio IP Ventures in one such non-practicing entity who has attacked thousands of businesses, of all sizes, for infringing on WiFi-related patents that were formerly owned by Broadcom.

Another NPE that's also targeting businesses who infringe WiFi-related patents is Wyncomm LLC. Wyncomm has asserted that companies who use WiFi-compliant devices are infringing on U.S. Patent No. 5,506,866 - "Side-channel communications in simultaneous voice and data transmission."
Wyncomm claims that entities, such as Acer, Apple, and Casio Computer infringe this patent by importing, making, providing, selling, and/or providing and causing products that use WiFi to be used. Wyncomm filed dozens of suits against various firms in 2013, as this patent was going to expire in November of 2013, and the firm wanted to take advantage of it for as long as possible.

Wyncomm targeted Apple's iPhone and iPad and Casio's GzOne Bouler as devices that allegedly infringe the '866 patent, which transmits data through a WiFi network and converts information that represents analog data into voice or sound.

Sources:

http://www.essentialpatentblog.com/2013/04/non-practicing-entity-wyncomm-llc-claims-wifi-devices-infringe-former-att-patent/

http://www.law360.com/articles/432082/apple-asus-targeted-in-wi-fi-patent-blitz