Im researching into these V blade slicers and accordingly the first V-blade slicers, mader by Borner, patents expired back in 1989.
Here's a patent they had but expired:
However they keep applying for new patents for products with similar features.
Example of patent here:
The product i've researched into is this:
Quite a few sellers sell this item but not sure would it infringe on any patents from Borner.
Hope someone can help because this situation is rather confusing.