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If you have an invention which is suitable for many areas around the world, should you file an international patent application straightaway?
If you are sure the invention is unique, then file an international (PCT) patent application straightaway. However, initially it is likely to be cheaper filing a domestic patent application and obtaining a good quality initial search from the local patent office. If the search is positive, then with greater confidence file your PCT within 12 months and with a priority claim.
Save money by giving as many details, drawings, embodiments and possible modifications to your invention at the beginning of the patenting process.
This should avoid re-filing to add in new material at a later date, thus keeping your costs down.