The Cafι front page has a link to a request Gibson filed back in 2014 with the US PTO to trademark the F-5 shape.
I for one do not now associate Gibson with the F-5 design (I have a Flatiron F-5 that I bought in 1984 that is my main F-5), and the avowed purpose of trademark law is to prevent consumer confusion as to source.
Whatever the merits of such an effort would have been back in the mid-1920s when they first came up with the shape, it strikes me as peculiar (to say the least) to seek to trademark the shape nearly 90 years later, after an entire industry has been built up making F-5-shaped instruments. One can lose a trademark in a term if it becomes "genericized." (Two well-known historical examples are (cellophane and aspirin.)I would expect the same would be true for a shape.
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