Article: Stock index values firms on basis of their patents: Chicago's Ocean Tomo ranks 300 companies.

Byline: Jon Van

Nov. 15--The Dow Jones industrial average and the Standard & Poor's 500 constitute an exclusive club, one the Ocean Tomo 300 patent index wants to join.

Launched last month by Ocean Tomo, a Chicago-based intellectual-property firm, the stock index consists of 300 diverse companies that Ocean Tomo ranks as having the strongest patent portfolios going.

The firm believes an information-based economy needs a way for people to make investment decisions based upon intellectual-property assets, and the new index is intended to enable that.

"When the S&P 500 started in 1975, 80 percent of the market value of companies ...

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