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Netlist Inc. Message Board

  • sherryjohn727 sherryjohn727 Jul 22, 2014 11:24 AM Flag


    How long is a patent valid?

    A patent provides protection for up to twenty years, counting from the filing date (the date given with reference numeral 22 on the front page). US patents with a filing date before June 8, 1995 provide protection for up to seventeen years counting from the date of grant (the date given with reference numeral 45), or 20 years from the filing date, whichever expires later.

    However, the patent holder is required to pay maintenance fees to keep his patent valid. In most European countries, these fees are yearly. The USA requires maintenance fees to be paid at 3.5 years, 7.5 years, and 11.5 years after issuance. If the holder does not pay a maintenance fee, the patent becomes abandoned. Many patents are abandoned before the full twenty year term because the cost of the maintenance fees (which increases with the lifetime of the patent) exceeds the patent's value.

    Sentiment: Strong Buy

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