Assertion: patent's claim | /r/HasProperty | directed to same subject matter
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Source sentences:
text: Also, in the United States, prior to the America Invents Act going into force in 2012, if two patent applications are filed which set forth claims directed to the same subject matter, the patent office could declare an "interference" and require that each of the parties appear before the patent office to determine who was the earliest to discover the claimed invention.