/ˈbækˌɡraʊnd əv ðə ɪnˈvɛnʃən/ – Phrase
Definition: Lịch sử phát minh.
A more thorough explanation: the part of a US patent application which describes the area of use to which the invention relates, any similar prior inventions and the problem solved by the invention
Example: The background of the invention introduces the subject material and compares it to other products in the field.