Existing technology: A 22 the existing technology mentioned in this law refers to the technology known to the public at home and abroad before the date of application.
Background art: it may belong to the prior art, but it does not necessarily belong to the prior art.
(1) There is evidence to prove that it was published on the filing date (priority date) → prior technology.
(2) The technology has not been made public before the filing date (priority date), even if the author thinks that there are still some shortcomings in the technology and writes it into the background technology, it cannot be regarded as existing technology.
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