The USPTO’s Patent Application Information Retrieval (PAIR) sytem now lists expirations due to failure to pay maintenance fees. Expired patents now have a status of "Patent Expired Due to Non-Payment of Maintenance Fees Under 37 CFR 1.362". Patents can, of course, expire in other ways. If a patent is subject to a terminal disclaimer relative to a previous patent and they cease to be commonly owned, for example.
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Editor-in-Chief Barista Stephen Jenei is a patent attorney and Owner of Jenei LLC. When not serving up patent chat over a steaming cup of java, he's handling a diverse intellectual property practice in the biotechnology, pharmaceutical and chemical fields. More info @ Jenei LLC
