Apple, Dell, HP, Lenovo, Sony sued over power management - Wikimedia Commons

More litigation has kicked off in the Eastern District of Texas Tyler Division where a firm has filed suit against Sony, Dell, HP, Lenovo and Apple.

This district court is often chosen in patent cases because judgements are swifter there.

Optimum Power Solutions says it owns US patent number 5,781,784 - called Dynamic power management of solid state memories.  The patent was issued on july 14, 1998.

According to Optimum, the patent describes a power management device and logic control circuitry which supplies variable voltage to solid state memory devices.

The suit alleges that Apple breaches the patent on the Apple MacBook Pro that uses an Intel Core 2 Duo CPU with a 3MB L2 cache.

Dell allegedly breaches the patent with the Dell Studio 1555 notebook.

HP makes the Pavilion dv3-2150us notebook using an Intel Core 2 Duo CPU - the T6500. That breaches the patent, alleges Optimum.

Lenovo makes a ThinkPad T500 and that breaches the patent, the suit alleges.

Finally, Sony is alleged to breach the patent on its Sony Vaio Z notebook.

Optimum wants damages and the like.