Prior art

To identify the most relevant prior art for US patent 11574991, I would typically access the USPTO database or a similar patent search platform to retrieve the "Cited By" or "References Cited" section of the patent. This section lists all the prior art references that the patent examiner and the applicant considered during prosecution.

Since I cannot directly access and browse live databases, I will identify relevant prior art from the information provided in the patent text itself, which lists the "Prior art keywords" and "Other versions" and the "Cross-reference to related applications" section. However, the most direct and accurate way to find "prior art" in the context of 35 U.S.C. § 102 would be to examine the "References Cited" section of the issued patent. The provided text does not explicitly list the "References Cited" section with individual patent citations. It only mentions the "Prior art keywords" and a chain of continuation applications.

Based on the provided patent text, I can infer related applications that served as part of the patent family and would be considered prior art for certain claims if their filing dates precede the priority date of the claims in question. However, this is distinct from the prior art identified by the examiner from other inventors or publications.

The patent US11574991B2 claims priority to and is a continuation of a series of U.S. patent applications, ultimately tracing back to Korean Patent Application No. 10-2012-0084976 filed on August 2, 2012. These applications, while part of the same patent family, would generally not be considered "prior art" against themselves under 35 U.S.C. § 102 unless there was a lapse in continuity or a different inventive entity. However, if any claims in US11574991B2 are not supported by the earliest priority date, then publications or patents filed before the effective filing date of those specific claims could be considered prior art.

To provide the most relevant prior art in the sense of external citations that potentially anticipate claims, a direct review of the "References Cited" section on the USPTO website for US patent 11574991 would be necessary. Without this direct access, I cannot list individual prior art patents, their publication/filing dates, brief descriptions, or which specific claims they anticipate under 35 U.S.C. § 102.

What constitutes prior art:

Prior art includes all publicly available information about inventions that already exist at the time a patent application is filed. This includes previously patented inventions (worldwide), inventions described in printed or electronic publications, and inventions already in public use or on sale. Prior art is crucial because an invention must be "novel" and "non-obvious" to be patentable. If a claimed invention is already public knowledge or would have been obvious to a person of ordinary skill in the art based on existing prior art, it will not receive a patent.

To perform a thorough prior art search, it's recommended to use patent databases like those provided by the USPTO, the European Patent Office (Espacenet), and the World Intellectual Property Organization (Patentscope). The USPTO offers a Patent Public Search tool for enhanced access to prior art.