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Duplicate Patents

Posted by Ian Wilson |

Why many patents appear to be duplicates

There are a number of reasons why duplicate patents appear in the list, here are some of the principal reasons:

  • Multiple regions - A patent may originally be filed in Japan, for example, then filed in different locations around the world. So the same patent, essentially, may also have a US filing number, a European filing number and a World fining number. Perhaps to simplify at some point we could just show one version and reference any connected patents.
  • Patent additions - Extensions or additions to original patents can be filed (called a "family" of patents) and these may appear the same while they actually are different in some areas.
  • Pending and granted patents - Some patents originally entered as pending may also show up under granted after they have been granted. Also patents may be pending in one location while granted in another.
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