A first to file patent system and a first to invent system are use to define who is entitle to a patent for the invention. There are only two countries that use first to invent system nowadays which is United States and Philippines. All the rest uses the first to file system.
First to File, in this system, the inventor who is the first to file a patent application, regardless of the date of invention is entitling to the patent.
First to Invent, in this system, the patent is granted to the inventor who first conceived of the invention and the diligently reduced it to practice by filing a patent application.
References
http://www.generalpatent.com/first-file-vs-first-invent-who-really-benefits-changing-u-s-patent-system
http://www.freepatentsonline.com/help/item/First-to-File.html
http://www.ipfrontline.com/depts/article.asp?id=17632&deptid=2
It is a new writting and I think it is so small. But it is the new area of law which we aware of it through your blog.
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