In Nortel's recent bankrupcy, the liquidation of the IP assets led to a bidding war. Google offered $900M for the patents; Apple and Microsoft created an alliance (with RIM, Sony, EMC, Ericsson) to offer $4.5B for the same patents^. Certainly there was a great disparity in these bid prices. How can you objectively determine the value of a portfolio and patent duration. Let the tools at IPstreet.com help you.
In Article I, Section 8 of the Constitution of the United States it says, " Congress shall have power [...] to promote the progress of science and useful arts by securing for limited times to inventors the exclusive right to their respective discoveries."
Laws of nature: Galileo would not be able to patent his findings from his experiments at the Leaning Tower of Pisa. Physical phenomena: Patent law classifies physical phenomena as products of nature. Thus, if your invention occurs in nature, it is a physical phenomenon and cannot be patented. Abstract ideas: Abstract ideas are concepts like pure mathematics and algorithms. You cannot patent a formula. However, you can patent an application of that formula. Thus, while you cannot patent a mathematical formula that produces nonrepeating patterns, you can patent paper products that use that formula to prevent rolls of paper from sticking together. Literary, dramatic, musical, and artistic works: These can be Copyright protected. Inventions, which are considered not useful or possible: For example, the USPTO will not issue a patent on a perpetual motion machines; or offensive to public morality.
IPstreet.com will help you with you understand patents better and provide you with the tools to take your patent searching to a new level.
Developing a portfolio strategy requires understanding the temporal effects of the economy, competitors, and internal development. Using IP Street, you can have a sharper vision of what is, so you can engineer what will be.