Mosaid, the semiconductor memory and communications intellectual property outfit, is shouting at every company it can think of about patent infringement.
Companies accused of breaching patents, and filed in the US District Court for the Eastern District of Texas are: AsusTek, Atheros, Canon USA, Dell, Digi International, Huawei, Intel, Lexmark, Marvell, Murata Manufacturing, Ralink Technology Corporation, Realtek Semiconductor, Research in Motion, Wasp Barcode Technologies, Wistron Corporation and Venture Research.
Patents are mainly communications based. The first patent in question is 5,131,006 which is for carrier detection for a wireless local area network. That's whereby a LAN uses a wireless transmission link and has network stations, with polarised antennas. Then data transmission uses spread spectrum in the receiver, utilised in an integrator and registers a circuit, providing orrelator outputs that are integrated in symbol intervals.
Patent 5,151,920 is a radio LAN station, with an improved frame delimiter detection for a spread spectrum environment, while 5,422,887 is for medium access protocol for a wireless local area network. That's when a station broadcasts information over a wireless LAN, before waiting to let other stations communicate before broadcasting another frame of information - Mosaid says it improves access fairness and reduces collision probability, increasing data flow through the network.
Patent number 5,706,428 relates to multirate wireless data communications and patent 6,563,786 relates to orthogonal frequency division multiplexing system with a selectable rate. Patent 6,992,972 relates to a frequency division multiplexing system with selectable rate.
Mosaid says it has licensed its portfolio of patents and applications out to 15 companies that have "recogised the value" of the IP - possibly following legal threats from Mosaid.
Just a couple of days ago, Mosaid announced that it had settled a patent agreement with both LG and MediaTek, granting both licenses to use microcomponents and microcomponents in semiconductors.