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Fight heats up over patents on Caller ID. (Kazuo Hashimoto)

Kazuo Hashimoto, known as the father of the telephone answering machine, filed his first patent on the device in 1958. Hashimoto has been working on phone-related inventions for 37 years. He filed for a Caller ID in Japan in 1976, and he received a US patent in 1980 and another in 1985. When Hashimoto charged AT&T with infringement of his Caller ID patents, AT&T responded with a challenge of Hashimoto's patents, asking the US Patent & Trademark Office to reexamine and disallow the inventor's claims. The patent was upheld, however, and AT&T has agreed to a confidential out-of-court settlement. Industry observers expect that other vendors will agree to pay royalties.

Caller ID has been ...

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