You must file for patents in foreign countries within a year of filing a US patent application, in order to use the effective (“priority”) filing date of the US application. A very important point to keep in mind is that most foreign countries do not allow patents to be sold or published before they are granted. The USPTO typically responds to applicants this year before committing to filing overseas at great expense the following year.
It is recommended that you start the 1-year foreign filing period with a Provisional Application, if you intend to use the earlier Provisional filing date as the “Priority Date” for the foreign application(s).
Applicants planning to file abroad must file their US and foreign applications by the end of the year following the date of their Provisional Applications. If not spread out over a year, this could lead to a very large expense if both forms are filed simultaneously.
If this occurs, most applicants will have exhausted their one-year grace period before deciding where to apply before submitting a formal application. The later filing date of the formal application can always be used as your priority date unless there’s a publication or other similar circumstance that prevents it.
So, you might to know about the process to file a provisional patent. With this, proceed with the right process.