According to Japan patent website EGAMI, Canon filed a new lens patent for Canon APS-C DSLR cameras. This lens is Canon EF-S 9-22mm f/4.5-5.6 STM lens.
Japanese website EGAMI has posted a new patent for Nikon AF-S NIKKOR 600mm f/4E FL ED VR lens. This lens will replace current AF-S NIKKOR 600mm f/4G ED VR lens, with new Fluorine Coating feature. Currently, there are already two super telephoto prime lenses with Fluorine Coating: AF-S NIKKOR 400mm f/2.8E FL ED VR and AF-S NIKKOR 800mm f/5.6E FL ED VR.
According to egami, Sigma posted several new lens patents for APS-C cameras, these lenses are wide-angle zoom lenses, which is to be some new art lenses.
Canon filed some new prime lens patents in Japan. These are EF 85mm f/1.2L III, EF 85mm f/1.8, EF 50mm f/1.4, EF 100mm f/2.
Canon filed some new wide-angle zoom lens patents in Japan. These are 16-35mm f/4, 17-40mm f/4, 17-40mm f/2.8-4, 16-35mm f/2.8.
Tamron filed two new macro lens patents in Japan for APS-C cameras. These are Tamron 30mm f/2.8 Macro and Tamron 28mm f/2.5 Macro.
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Canon filed several new prime lens patent in Japan with image stabilizer feature. These are EF 85mm f/1.8 IS, EF 100mm f/2 IS, EF 135mm f/2.8 IS.