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Patent no.

Hver enkelt patent har et unikt patent nummer. Et nummer der er registreret hos den eller de offentlige patent myndigheder, der hvor patentet er givet. Man kan ved hjælp af patent nummeret finde frem til hvem opfindren er, opfindelsens beskrivelse, tegninger og mange andre nyttige oplysninger.

Patent letter

Patent letter or Letter Patent. The name of an instrument granted by the government to convey a right to the patentee; as, a patent for a tract of land; or to secure to him a right which he already possesses, as a patent for a new invention or discovery; Letters patent are a matter of record. They are so called because they are not sealed up, but are granted open. Vide Patent.