• All sections
• G - Physics
• G02B - Optical elements, systems or apparatus
• G02B 15/20 - 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 interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Patent holdings for IPC class G02B 15/20

Total number of patents in this class: 867

10-year publication summary

Principal owners for this class