vincenthoy28 寫:
Terry Sham 寫:
乜Expired之後就唔可以再申請再續咩?
As far as I remember, there is some limitation of extending patent. I understand (correct me if I am wrong) that the patent will subject to the location like Japan, patent only valid for 10 yr. This is one of the major reason Canon can defending others on using USM motor on lens for 10 yr...
patent can be divided into 2 types, one is national and another one is international thru PCT. normally applying national patent is faster and cheaper but it just protects the invention for 20 years and ultility/design for 10 years in the registered country, while, even though international patent will cost a lot of time and money but it covers more than 200 countries.
patent renew year by year, it got to pay everytime of renewing. if inventors give up the renewal right, the patent would be terminated and the right of use would be released to public.
something like that...
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