
Viltrox has a patent for what appears to be a new 28mm pancake autofocus full-frame lens. The patent number is CN308440949S – it was filed on July 20, 2023, and it was published on January 26, 2024:

Fujinon XF18-300mm F3.5-6.5 OIS, XF16-200mm F3.5-6.5 OIS, and XF16-150mm F4-6.5 OIS Patents Found Sigma 50-135mm f/2.8 DC DN Patent Found Sigma 65mm F1.4 DG DN and Sigma 50-135mm f/2.8 DC DN APS-C Patents Found Tamron 15-28mm f/2.8, 24-70mm f/4, and 24-50mm f/2 Patents Found Sony Camera Vibration Patent