Patent Assignment Data Restructure

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In order to restructure the current patent dataset, the data requires rigorous cleaning. The primary areas for improvement are:

1. Clean ptoassignment table to unique keys.
2. Clean ptoproperties to remove nonutility patents. The patent numbers currently include:
  • 7 digit patent numbers
  • application numbers
  • unknown numbers that cannot be matched to patent numbers in the patent table
20090108066
20100007288
20090108066
20100110022
  • Design and Reissue patents ('%D%' or '%RE%')
  • alphanumeric character strings
3. Clean ptoassignee to extract address components and clean it up.
4. Check all patent numbers accounted for in ptoassignee_currentusa.
5. Correspondence address clean up.
6. Transform structure of the dataset.