This post gives a recommended procedure for making changes to inventor or applicant details of a PCT application.
TL;DR - do this centrally at WIPO under Rule 92.bis.
Singapore Intellectual Property Blog
Changing Inventor or Applicant Details in a PCT Patent Application
When is the Grant Fee Due on a Singapore Patent Application?
The deadline for paying the grant fee, for a Singapore patent application, is 60 months from the priority date.
Obtaining International Patent Protection under the Patent Cooperation Treaty (PCT)
Many patent applicants want protection not only in their country of origin, but also in other countries around the world.
Typically, in order to get worldwide protection, one would file a priority application and 12 months later one or more foreign applications. The foreign applications may claim priority from the priority application.
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