• All sections
• G - Physics
• G02B - Optical elements, systems or apparatus
• G02B 15/173 - 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 a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged + – +

Patent holdings for IPC class G02B 15/173

Total number of patents in this class: 411

10-year publication summary

Principal owners for this class