• All sections
• G - Physics
• G02B - Optical elements, systems or apparatus
• G02B 15/28 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group arranged + – +

Patent holdings for IPC class G02B 15/28

Total number of patents in this class: 21

10-year publication summary

Principal owners for this class