http://www.invention-protection.com...nance_Fees.html
Pay Those Patent Maintenance Fees

© 2003, Gallagher & Dawsey Co., LPA
January 2003

A utility patent holder must pay issuance fees at 3 years and 6 months, 7 years and 6 months, and 11 years and 6 months after grant. The fees currently range from $890 for the first maintenance fee to $3150 for the last maintenance fee, with small entities paying half those amounts. The fees are due on or before the date the maintenance is due, although there is a six month grace period after the due dates, during which time the maintenance fees can be paid with, currently, a $130 (half for small entities) fee.

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$890 for the first maintenance fee to $3150 for the last maintenance fee
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[十年美國專利計算, 如果專利不能給你至少兩百萬美元的收入] ==> 你在鬼扯些什麼 ? 人家美國專利商標局最多不過是收三千美元 . 您硬要拿五十萬/一百萬美元去孝敬美國專利商標局的話 , 布希大概真的要提拔生財有道的您來接管 USPTO .

多唸點有用的東西再開口也不遲 !