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　OA,，指Office Actions，具體是指在美國專利申請過程中，實質審查時，美國專利局向專利申請人發出的關于專利申請方面（尤其是專利申請文件）的官方意見，這種官方意見通常相當于中國國家知識產權局發出的實質審查通知書，因此，在中國業界，有時直接稱審查通知書為OA。以下是美國專利局網站，關于OA的解釋：
　　Office Actions
　　Office actions are letters from the USPTO that set forth the legal status of a trademark application. They are issued by trademark examining attorneys who are assigned to each application. There are several types of office actions: examiner’s amendments, priority actions, non-final office actions, final office actions, and suspension letters. Please read below for a definition of each type, as well as information on how to respond to them.

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