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Regarding your question about priority, as long as you file your international patent application
within 12 months of your domestic application, you can claim priority back to the date of the domestic application - you must claim the priority in your international application:
"Generally, patent applicants who wish to protect their invention in more than one country first file a national or regional patent application with their national or regional patent Office, and
within 12 months from the filing date of that first application (a time limit set in the Paris Convention for the Protection of Industrial Property), they file their international application
under the PCT. Thus, in an international patent application, you may claim the priority, under the Paris Convention – and to a certain extent within the framework of the World Trade Organization –, of one or more earlier patent applications for the same invention, whether
they were national, regional or international applications, for up to 12 months after the filing of the earliest of those applications. If you do not claim priority of an earlier application, the priority date for the purposes of the PCT procedure will be the international filing date of the international application. During the PCT procedure, priority claims may be added and corrected, within certain time limits. "
For information regarding the application process, the USPTO has multiple resources to assist applicants in filing an international patent to protect their creations abroad.
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