{"id":15380,"date":"2025-09-01T15:16:40","date_gmt":"2025-09-01T06:16:40","guid":{"rendered":"https:\/\/www.iir.hit-u.ac.jp\/en\/?p=15380"},"modified":"2026-10-07T15:47:50","modified_gmt":"2026-10-07T06:47:50","slug":"results-20261007-3","status":"publish","type":"post","link":"https:\/\/www.iir.hit-u.ac.jp\/en\/2025\/09\/01\/results-20261007-3\/","title":{"rendered":"\u3010Kentaro Nakajima\u3011The Impact of Military Technology Development on Innovation: Evidence from Prewar and Wartime Japanese Secret Patents"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"15380\" class=\"elementor elementor-15380\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bc73fa7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"bc73fa7\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b565408\" data-id=\"b565408\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-455b9f0 elementor-widget elementor-widget-text-editor\" data-id=\"455b9f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff0000;\">\u25b6<\/span><span style=\"color: #000000;\"><strong>Category\uff1a<\/strong><\/span> Working Paper(outside IIR)<\/p><p><span style=\"color: #ff0000;\">\u25b6<span style=\"color: #000000;\"><strong>Author<\/strong><\/span><\/span><span style=\"color: #000000;\"><strong>\uff1a<\/strong>Kotani, Atsuki\uff1aKentaro Nakajima\uff1aTetsuji Okazaki\uff1aYukiko U. Saito<br \/><\/span><br \/><span style=\"color: #ff0000;\">\u25b6<\/span><span style=\"color: #000000;\"><strong>Institution\uff1a<\/strong>RIETI Discussion Paper Series<br \/><\/span><br \/><span style=\"color: #ff0000;\">\u25b6<\/span><strong>Number\uff1a<\/strong>25-E-093<\/p><p><span style=\"color: #000000;\"><strong><span style=\"color: #ff0000;\">\u25b6<\/span><\/strong><\/span><strong>Release <\/strong><span style=\"color: #000000;\"><strong>Date\uff1a<\/strong>2025\/09\/01<\/span><\/p><p><span style=\"color: #ff0000;\">\u25b6<strong><span style=\"color: #000000;\">Article Title<\/span><\/strong><\/span><strong>\uff1a<\/strong>The Impact of Military Technology Development on Innovation: Evidence from Prewar and Wartime Japanese Secret Patents<br \/><strong><br \/><span style=\"color: #ff0000;\">\u25b6<\/span>Abstract\uff1a<\/strong>Innovations in military technology potentially drive significant societal transformations through applications to civilian use. This study aims to quantitatively measure the impact of military technology development on civilian innovation activities using prewar and wartime Japanese patent data from 1916 to 1945. By exploiting Japan&#8217;s secret patent system, which classified particularly critical military-related technologies not disclosed to the public, we identify important technological developments. The result shows that the filing of secret patents led to a significant increase in the number of patents within the corresponding technological classifications. Furthermore, this effect is not limited to organizations that registered secret patents; a significant impact is also observed among organizations that did not register secret patents. This suggests that the development of militarily important technologies generates a substantial spillover effect on other organizations.<br \/><strong><br \/><span style=\"color: #ff0000;\">\u25b6<\/span>Notes\uff1a<\/strong><\/p><p><span style=\"color: #ff0000;\">\u25b6<\/span><strong>URL\uff1a<\/strong><span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.rieti.go.jp\/en\/publications\/summary\/25090021.html\">https:\/\/www.rieti.go.jp\/en\/publications\/summary\/25090021.html<\/a><a style=\"color: #3366ff;\" href=\"https:\/\/link.springer.com\/article\/10.1007\/s42973-025-00214-8\"><br \/><\/a><\/span><strong><br \/><span style=\"color: #ff0000;\">\u25b6<\/span>Register date\uff1a<\/strong>2025\/09\/01<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u25b6Category\uff1a Working Paper(outside IIR) \u25b6Author\uff1aKotani, Atsuki\uff1aKentaro Nakajima\uff1aTetsuji Okazaki\uff1aYukiko U. Saito \u25b6Institution\uff1aRIETI Discussion Paper Series \u25b6Number\uff1a25-E-093 \u25b6Release Date\uff1a2025\/09\/01 \u25b6Article Title\uff1aThe Impact of Military Technology Development on Innovation: Evidence from Prewar and Wartime Japanese Secret Patents \u25b6Abstract\uff1aInnovations in military technology potentially drive significant societal transformations through applications to civilian use. This study aims to quantitatively measure the impact of military technology development on civilian innovation activities using prewar and wartime Japanese patent data from 1916 to 1945. By exploiting Japan&#8217;s secret patent system, which classified particularly critical military-related technologies not disclosed to the public, we identify important technological developments. The result shows that the filing of secret patents led to a significant&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"common","vkexunit_cta_each_option":"","footnotes":""},"categories":[61,64],"tags":[],"class_list":["post-15380","post","type-post","status-publish","format-standard","hentry","category-results","category-wokingpaper"],"veu_head_title_object":{"title":"","add_site_title":""},"_links":{"self":[{"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/posts\/15380","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=15380"}],"version-history":[{"count":6,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/posts\/15380\/revisions"}],"predecessor-version":[{"id":15386,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/posts\/15380\/revisions\/15386"}],"wp:attachment":[{"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=15380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=15380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iir.hit-u.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=15380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}