Term of patent in the United States patent term due to expire usually 20 years in the US 17 to 20 years 20 year patent length of patents 20 years term of the patent Since never if a patent application wasn't examined in time due to expire 20 years https://en.wikipedia.org/wiki/Term_o..._United_States term of United States patents 20 years Patents do expire due to expire http://en.wikipedia.org/w...tent_in_the_United_States 20 years twenty-year patent usually 20 years in the US http://en.wikipedia.org/wiki/Term_of..._United_States Patents do expire Wikipedia article usually 20 years in the US terminal disclaimer Wikipedia reference http://en.wikipedia.org/wiki/Term_of..._United_States terminal disclaimer usually 20 years in the US expired It should not be possible 17 to 20 years 20 years 20 years 20 years for a set term en.wikipedia.org https://en.wikipedia.org/wiki/Term_o..._United_States 17 years Term of patent in the United States generally valid for 17 years Term of patent in the United States term of United States patents 20 years due to expire 20 years He's right. 20 years term of United States patents terminal disclaimer