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Another super-telephoto diffractive optic patent
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Another super-telephoto diffractive optic patent

This patent deals with joining an aspherical element with a DO element group.

In this patent is listed embodiments for a 300 2.8 IS DO and another 400 4.0 IS DO.

Canon continues to work on improving the diffractive optical super telephotos, and maybe just maybe we'll see a 300mm DO similar to what Nikon has come out with.

Read more US Patent Application 20170168269

 

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How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

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