(Agencies)
Updated: 2008-01-27 15:50

The system could space sensors 8 feet apart, in ceilings, floors, shelving and displays, so they could capture signals transmitted every 1.5 seconds by microchipped shopping carts.

The documents "raise the hair on the back of your neck," says Liz McIntyre, co-author of "Spychips," a book that is critical of the industry. "The industry has long promised it would never use this technology to track people. But these patent records clearly suggest otherwise."

Corporations take issue with that, saying that patent filings shouldn't be used to predict a company's actions.

"We file thousands of patents every year, which are designed to protect concepts or ideas," Paul Fox, a spokesman for Procter & Gamble, says. "The reality is that many of those ideas and concepts never see the light of day."

And what of his company's 2001 patent application? "I'm not aware of any plans to use that," Fox says.

Sandy Hughes, P&G's global privacy executive, adds that Procter & Gamble has no intention of using any technologies - RFID or otherwise - to track individuals. The idea of the 2001 filing, she says, is to monitor how groups of people react to store displays, "not individual consumers."

NCR and American Express echoed those statements. IBM declined to comment for this story.

"Not every element in a patent filing is necessarily something we would pursue....," says Tenzer, the American Express spokeswoman. "Under no circumstances would we use this technology without a customer's permission."

McIntyre has her doubts.

In the marketing world of today, she says, "data on individual consumers is gold, and the only thing preventing these companies from abusing technologies like RFID to get at that gold is public scrutiny."

RFID dates to World War II, when Britain put transponders in Allied aircraft to help radar crews distinguish them from German fighters. In the 1970s, the US government tagged trucks entering and leaving secure facilities such as the Los Alamos National Laboratory, and a decade later, they were used to track livestock and railroad cars.

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