term a patent lasts twenty years a 20-year period Patents only last 20 years. patent period term a patent lasts twenty years term https://en.wikipedia.org/wiki/Term_of_patent https://en.wikipedia.org/wiki/Term_of_patent Википедия term of patent term of protection https://en.wikipedia.org/wiki/Term_of_patent#Jurisdiction http://en.wikipedia.org/wiki/Term_of_patent term of protection a 20-year period http://en.wikipedia.org/wiki/Term_of_patent Википедия en a patent lasts twenty years http://en.wikipedia.org/wiki/Term_of_patent#United_States