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Last week Motorola filed another complaint in a U.S. District Court in Delaware. Current company's approach is to invalidate 11 patents that were awarded to NeXT Software and Apple (which are both known to be founded by Steve Jobs).

It is said in Motorola's suit that these patents were named in Apple's complaints against HTC and other handset makers that use Google's Android OS in their smartphones. That explains why company wants to prove that these patents are invalid.

Here is the list of the patents that were named in the lawsuit:

• U.S. Patent No. 5,455,599: "Object-oriented graphic system"
• U.S. Patent No. 5,519,867: "Object-oriented multitasking system"
• U.S. Patent No. 5,566,337: "Method and apparatus for distributing events in an operating system"
• U.S. Patent No. 5,915,131: "Method and apparatus for handling I/O requests utilizing separate programming interfaces to access separate I/O services"
• U.S. Patent No. 5,929,852: "Encapsulated network entity reference of a network component system"
• U.S. Patent No. 5,946,647: "System and method for performing an action on a structure in computer-generated data"
• U.S. Patent No. 5,969,705: "Message protocol for controlling a user interface from an inactive application program"
• U.S. Patent No. 6,275,983: "Object-oriented operating system"
• U.S. Patent No. 6,343,263: "Real-time signal processing system for serially transmitted data"
• U.S. Patent No. 6,424,354: "Object-oriented event notification system with listener registration of both interests and methods"
• U.S. Patent No. RE39,486: "Extensible, replaceable network component system"

As you remember, few weeks ago Motorola had accused Apple of violating of its own 18 patents that are related to a different technologies like 802.11 wireless, GPRS, antenna design and 3G.