Changes

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:add 4 years to issue date after 3.5yr fee
:add 4 years to issue date after 7.5 year fee
:add difference up to 20 years from filing (application) date after 11.5 year fee
*Patent issued between june 7 1978 and june 8 1995 will have the term which max(file date + 20 years, issue date + 17 years)
::for those patents using 20 years + file (application) date, same as after june 8 1995
::for those using 17 years + issue date

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