optimal duration of patents
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optimal duration of patents
duration of a patent
patent length of time
duration of patent protection
patent in united states duration
how long are patents
how long are patents good
how long is a typical patent
how long a patent lasts
patent how long does it last
optimal duration of patents, duration of a patent, patent length of time, duration of patent protection, patent in united states duration, how long are patents, how long are patents good, how long is a typical patent, how long a patent lasts, patent how long does it last