Prosecution Insights
Last updated: August 17, 2026

Examiner: LEITH, NANCY J

Tech Center 1600 • Art Units: 1600 1636 1656 1681

This examiner grants 75% of resolved cases

Performance Statistics

74.7%
Allow Rate
+14.7% vs TC avg
879
Total Applications
+43.8%
Interview Lift
1106
Avg Prosecution Days
Based on 825 resolved cases, 2023–2026

Rejection Statute Breakdown

8.8%
§101 Eligibility
10.3%
§102 Novelty
29.4%
§103 Obviousness
29.1%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19272775 METHODS AND COMPOSITIONS FOR MODULATING A GENOME Final Rejection Flagship Pioneering Innovations VI, LLC
19272711 METHODS AND COMPOSITIONS FOR MODULATING A GENOME Final Rejection Flagship Pioneering Innovations VI, LLC
18171578 METHODS AND COMPOSITIONS FOR GENERATING A DELETION LIBRARY AND FOR IDENTIFYING A DEFECTIVE INTERFERING PARTICLE (DIP) Non-Final OA The Regents of the University of California
17763110 NOVEL RECEPTORS HAVING A HETEROLOGOUS STOP TRANSFER SEQUENCE FOR LIGAND-DEPENDENT TRANSCRIPTIONAL REGULATION Non-Final OA The Regents of the University of California
19376282 GENE EDITING SYSTEMS AND USES THEREOF Non-Final OA CORRECTSEQUENCE THERAPEUTICS (SHANGHAI) CO., LTD
18272158 COMPOSITIONS AND METHODS FOR DELIVERING CARGO TO A TARGET CELL Non-Final OA MASSACHUSETTS INSTITUTE OF TECHNOLOGY
17742503 CRISPR-ASSOCIATED TRANSPOSASE SYSTEMS AND METHODS OF USE THEREOF Non-Final OA MASSACHUSETTS INSTITUTE OF TECHNOLOGY
17309426 METHODS FOR EX VIVO EXPANSION OF NATURAL KILLER CELLS AND USE THEREOF Non-Final OA Board of Regents, The University of Texas System
17977788 SYSTEM AND METHOD FOR HIGH-YIELD TRANSIENT EXPRESSION IN MAMMALIAN CELLS Non-Final OA LIFE TECHNOLOGIES CORPORATION

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