{"id":112716,"date":"2026-04-29T19:18:25","date_gmt":"2026-04-29T13:48:25","guid":{"rendered":"https:\/\/greyb.com\/?post_type=case_study&#038;p=112716"},"modified":"2026-04-29T19:19:32","modified_gmt":"2026-04-29T13:49:32","slug":"invalidating-a-menstrual-cup-patent","status":"publish","type":"case_study","link":"https:\/\/greyb.com\/case-studies\/invalidating-a-menstrual-cup-patent\/","title":{"rendered":"Invalidating a Menstrual Cup Patent to Enter a $350 Million Market"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Value Delivered<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GreyB identified clear prior commercial use and built a dual invalidity strategy using NPL and analogous art. This enabled the client to confidently challenge the patent in opposition, clearing a pathway to enter a $350 million market.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Problem Solved&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The client sought to invalidate a menstrual cup patent to strengthen an ongoing opposition case. This was a high-stakes mandate, as the patent\u2019s key claims had already survived following a prior round of opposition.The primary challenge was a specific claim limitation: a stem extension with a length greater than the cup body. An initial round of searching by the client had failed to identify prior art meeting this dimensional requirement, as most industry patents and commercial products featured stems significantly shorter than the device body.&nbsp;<\/p>\n\n\n<div id=\"post-carousel\" class=\"swiper\"><div class=\"swiper-wrapper\"><div class=\"swiper-slide\"><img decoding=\"async\" src=\"https:\/\/greyb.com\/wp-content\/uploads\/2026\/04\/Invalidating-a-Menstrual-Cup-Patent-to-Enter-a-350-Million-Market-1.png\" \/><\/div><div class=\"swiper-slide\"><img decoding=\"async\" src=\"https:\/\/greyb.com\/wp-content\/uploads\/2026\/04\/Invalidating-a-Menstrual-Cup-Patent-to-Enter-a-350-Million-Market-2.png\" \/><\/div><div class=\"swiper-slide\"><img decoding=\"async\" src=\"https:\/\/greyb.com\/wp-content\/uploads\/2026\/04\/Invalidating-a-Menstrual-Cup-Patent-to-Enter-a-350-Million-Market-3.png\" \/><\/div><\/div><div class=\"swiper-button-next\"><\/div><div class=\"swiper-button-prev\"><\/div><div class=\"swiper-pagination\"><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Solutions Offered<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Team executed a targeted Non-Patent Literature (NPL) search, shifting focus from traditional patent databases to consumer-facing blogs, forums, and product review sites. This methodology identified a commercial product that directly anticipated the primary claim limitation. To further solidify the invalidity position, the team mapped analogous art across the broader vaginal device domain, thereby addressing the patent&#8217;s claimed technical effect through an obviousness-based attack.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Get the full case study to discover how Greyb invalidated a menstrual cup patent to help client enter a $350 million market<\/strong>.<\/p>\n\n\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"66178\" class=\"elementor elementor-66178\" data-elementor-post-type=\"elementor_library\">\n\t\t\t<div class=\"elementor-element elementor-element-57a0d93 elementor-hidden-desktop elementor-hidden-laptop elementor-hidden-tablet e-flex e-con-boxed e-con e-parent\" data-id=\"57a0d93\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-73b2eb4 exad-sticky-section-no exad-glass-effect-no elementor-widget elementor-widget-heading\" data-id=\"73b2eb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Request Full Case Study<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98ba6f7 elementor-align-center bpopup-toggle exad-sticky-section-no exad-glass-effect-no elementor-widget elementor-widget-button\" data-id=\"98ba6f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Get in touch<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-784c512 exad-sticky-section-no exad-glass-effect-no elementor-widget elementor-widget-html\" data-id=\"784c512\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"hubspot-popup\">\r\n        <div class=\"hubspot-popup-content\">\r\n            <text><script text\/javascript charset='ecutf-8' type='text\/javascript' src='\/\/js.hsforms.net\/forms\/embed\/v2.js'><\/script><script text\/javascript>hbspt.forms.create({region: \"na1\",portalId: \"1791848\",formId: \"2121b045-8f86-4dc8-a76a-afa61f0abe05\"});<\/script><\/text>\r\n        <\/div>\r\n        <div class=\"clearfix\"><\/div>\r\n    <\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n\n\n\n<div data-elementor-type=\"section\" data-elementor-id=\"66177\" class=\"elementor elementor-66177\" data-elementor-post-type=\"elementor_library\">\n<div class=\"elementor-element elementor-element-dd85163 elementor-hidden-mobile e-flex e-con-boxed e-con e-parent\" data-id=\"dd85163\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n<div class=\"e-con-inner\">\n<div class=\"elementor-element elementor-element-c85364d exad-sticky-section-no exad-glass-effect-no elementor-widget elementor-widget-heading\" data-id=\"c85364d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n<div class=\"elementor-widget-container\">\n<h4 class=\"elementor-heading-title elementor-size-default\">Request Full Case Study<\/h4>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"elementor-element elementor-element-a8f2b17 exad-sticky-section-no exad-glass-effect-no elementor-widget elementor-widget-text-editor\" data-id=\"a8f2b17\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<p>Download in PDF Format and read anytime. Fill the form to get access to this article.\u200b<\/p>\n<p><text><script text\/javascript charset='ecutf-8' type='text\/javascript' src='\/\/js.hsforms.net\/forms\/embed\/v2.js'><\/script><script text\/javascript>hbspt.forms.create({region: \"na1\",portalId: \"1791848\",formId: \"2121b045-8f86-4dc8-a76a-afa61f0abe05\"});<\/script><\/text><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n\n","protected":false},"featured_media":112725,"parent":0,"template":"","meta":{"_acf_changed":false,"_angie_page":false,"content-type":"","service_relation":["20995"],"industry_relation":["61047"]},"class_list":["post-112716","case_study","type-case_study","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Invalidating a Menstrual Cup Patent to Enter a $350 Million Market - GreyB<\/title>\n<meta name=\"description\" content=\"Discover how Greyb invalidated a menstrual cup patent to help client enter a $350 million market.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/greyb.com\/case-studies\/invalidating-a-menstrual-cup-patent\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Invalidating a Menstrual Cup Patent to Enter a $350 Million Market - 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