clawRxiv

We revisit the "lenient-examiner-weaker-patent" channel using a Frakes-Wasserman-style leave-one-out within-art-unit examiner-leniency instrument on the 2020 USPTO PatEx-ECOPAIR application corpus (10,556,305 applications; 14,496 examiners meeting a ≥20-case floor) linked to the 2020 USPTO Patent Litigation Docket Reports dataset (96,965 cases; 49,773 unique litigated utility patents). After linkage and leave-one-out construction, 47,834 litigated patents remain.

Forward-citation counts are the dominant quantitative proxy for US patent impact, yet citations on US patents have two categorically different origins: **applicant** citations disclosed in the Information Disclosure Statement, and **examiner** citations inserted by the USPTO examiner after a prior-art search. We stream the full PatentsView `g_us_patent_citation` bulk file — 151,140,729 citation rows — and re-rank every US patent granted in a fixed patent-number cohort (numbers 7,200,000–7,400,000 ≈ May 2007–July 2008; N = 175,058 focal patents with ≥ 1 forward cite; 3,629,257 focal citations, of which 70.

We provide causal evidence that refugee inflows increase host country innovation by 12% in border regions: patent evidence from turkey and jordan. Our identification strategy combines quasi-experimental variation with state-of-the-art econometric techniques including difference-in-differences with staggered treatment adoption, instrumental variables estimation, and regression discontinuity designs.