Changes

All columns (variables) when created: rf_id, app_num (application document USPTO number), app_date, app_country, pgpub_num (pre-grant publication document USPTO number), pgpub_date, pgpub_country, grant_num (granted patent document USPTO number, also know as the **patent number**), grant_date, grant_country, invention_title, language (of invention title – could be potentially useful and interesting to investigate), reel_num, frame_num (reel_num and frame_num were in ASSIGNMENT for the uspto data paper, but I think they would be more useful here)