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Meaning of the word ‘Patent’

It is strange but the world’s best known dictionaries define the word ‘Patent’ differently, here are a few examples

Patent: Webster’s Encyclopedic Unabridged dictionary
‘The exclusive right granted by a government to an inventor to      
manufacture, use or sell an invention for a certain number of years.’

             Blacks Law Dictionary
‘The exclusive right to make, use, or sell an invention for a specific  
period granted by the federal government to the inventor if the device
or process   is novel, useful, and non-obvious.’

The inventor is granted right for a fixed period of time to exclude others
from making, using, or selling the defined invention in the US.

Microsoft Encarta Dictionary
‘ An exclusive right officially granted by a government to make or sell an

            American Heritage Dictionary
‘ A grant made by a government that confers upon the creator of an
invention the sole right to make, use, sell that invention for a period of

           Cambridge Encyclopedia Dictionary
‘ A formal document which gives inventors the exclusive right for a period
of years to exploit the product or process they have created, either by
operating it themselves or by licensing it to others to use it.’


          Shorter Oxford Dictionary
‘ A license from a government to an individual or organization conferring
for a set period the sole right to make, use, or sell some process or


         Merriam Webster Collegiate Dictionary
‘ A writing securing to an inventor for a term of years the exclusive right to
make, use, or sell an invention’