Patent data with founding year variable

This is the 10 July 2024 release of Founding Patents (see foundingpatents.com).  The data adds a founding year for a large fraction of US-based corporate assignees using information from OpenCorporates.  There are three files:ocpb_assigneeatfiling.csvThis is the primary data that contains the founding year and venture capital indicator.  Note that the venture capital indicator is time-invariant. The variables are defined here and in Table 1 of the accompanying paper:VariableTypeDescriptionpatent_idIntThe year the assignee was founded according to our search for the patenting firm in OpenCorporates as described in Appendix Section A of the paper.founding_yearintThe year the assignee was founded according to our search for the patenting firm in OpenCorporates as described in Appendix Section A of the paper.founding_scoreintThe confidence in assignee/OpenCorporates match (out of 10, see Appendix Section A in the paper).vc_backed_assigneeflag (boolean)A 0-1 variable that is equal to one if the company was ever VCbacked using our merge of Pitchbook to the assignee data as described in Appendix Section B of the paper.vc_scoreintConfidence in the assignee/PitchBook match (out of 10, see Section B.)initassignee_idstringan ID created by us to cover original as well as reassigned assignees. see initassignee_dxwalk20220630pv for the assignee ID from the PatentsView 30 June 2022 release, where it was possible to find a match.initassignee_organizationstringAssignee name, either from the 6/30/2022 release of PatentsView or from the Patent Assignment databasesame_as_20220630pvflag (boolean)indicates whether the assignee name is the same as in the 6/30/2022 edition of PatentsView (0) or whether it was replaced via the Patent Assignment file (1).assignee_organization_20220630pvstringAssignee name from the 6/30/2022 release of PatentsView. For assignees replaced via the Patent Assignment file, this will not match initassignee organization.assignee_id_20220630pvflag (boolean)Assignee ID from the 6/30/2022 release of PatentsView. PatentsView changes the assignee IDs with each release.initassignee_idxwalk20220630pvstringAssignee name from the 6/30/2022 release of PatentsViewfoundinocflag (boolean)was the initiassignee organization found in OpenCorporates?company_numberintCompany identifier from OpenCorporates (if found).gvkeystringlinkage to Compustat, from DISCERN Arora, Belenzon, and Sheer (2021)cusipstringlinkage to Compustat, from DISCERN Arora, Belenzon, and Sheer (2021)first_year_publicly_listedintThe year an assignee that was ever publicly-traded appeared on a U.S. exchange. Data was sourced from (Ritter, 2023), supplemented by manual searches.uo_discernflag (boolean)One if the firm was ever publicly-traded on a U.S. exchange, and the patent is assigned to that company (Arora, Belenzon, and Sheer, 2021).sub_discernflag (boolean)A 0-1 variable for whether the assignee was acquired by a publiclytraded firm on a U.S. exchange.univ_hospital_govflag (boolean)A 0-1 variable for whether the assignee is a university, a hospital, or a government entity (independent of PatentsView having classified it as a firm)is_us_assigneeflag (boolean)A 0-1 variable for whether the assignee is based in the U.S. (independent of PatentsView having classified it as such)initiassignee_crosswalk202206030pv.csvThis file provides PatentsView Assignee IDs (as of the March 30, 2022 release) for as many of the original/initial assignees as we could find. Original/initial assignees are from the USPTO Patent Assignment database, which does not contain Assignee IDs. We used the 2022 March 30 release of PatentsView to generate this database.assignee_crosswalk_20220630pv20240331pv.csvPatentsView occasionally changes the Assignee IDs.  This file provides a crosswalk between the version we used to build the data -- June 30, 2022 -- and  the March 31, 2024.