i) Deed of Agreement [signed]
i) Corporation Nationality Certificate [notarized]
The new entity can proceed with an assignment procedure based on merger, with certificate when and where the companies merged and the name and nationality of the new CEO.
They can use the web site of the Korea Intellectual Property Rights Information Service (KIPRIS) to conduct an online search of Korean Patent Abstracts (KPA) of registered applications. http://kpa.kipris.or.kr/kpa/search/search_kpa.do.
If it happens, the deadline is automatically shifted to the next working day.
Yes. But, it is not duty.
Yes. Assignments to multiple entities are allowed.