Questions tagged [door]

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why are patents granted that do NOT solve the problem they describe

As part of researching patents I came across one that claims to solve a problem that does actually exist. In broad ...
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Can I patent an old piece of hardware?

I have found a door handle that must be at least 100 years old. It is made of cast iron. There are no marks on it. I would assume this item is no longer patented, but if it were, how would I be able ...