Oh, interesting. HP’s Multi-Jet Fusion (MJF) is another method similar to high-speed sintering. However, it differs by the use of an additional detailing agent, rather than only using a heating agent.
Also, you’re wondering whether there are companies that are selling High-Speed Sintering 3D printers in commercial production? Indeed, there is at least one: voxeljet, and there are rumors of others to come such as Ricoh.
20180318/Google high-speed sintering
20180318/https://www.engineering.com/3DPrinting/3DPrintingArticles/ArticleID/14710/The-Coming-Proliferation-of-High-Speed-Sintering.aspx
20180318/https://www.voxeljet.com/unternehmen/news/voxeljet-introduces-high-speed-sintering-process/
20180318/https://www.voxeljet.com/3d-drucksysteme/vx200/