Historical Timeline: Women in US Patenting, 1900 to 2025
125 years of women in US patenting. Three structural shifts moved the needle. Most of the change happened after 1972.
In 1900, fewer than 1% of US patents named a woman inventor. By 2019, the share was 12.8%. The progress is real and the timeline is long.
This page walks the 125-year arc with the milestones, policy shifts, and structural changes that drove most of the movement. Three legal and institutional changes account for the bulk of it: married women's property reform in the late 19th century (which extended into the 20th), Title IX in 1972, and the Bayh-Dole Act in 1980.
The data is sparse for early decades and richer after the USPTO began publishing systematic name-gender analyses in the 1990s. Every era below names the best primary source we have for that period.
This article presents published research data for educational purposes. It is not legal, policy, or investment advice. Patent gender statistics depend on name-based inference and methodology choices: see How we measure.
Before 1900: the framing
The 1900-2025 window opens against a baseline that already had a century of context. Mary Dixon Kies received the first US patent issued to a woman in 1809 for a straw-weaving process used in bonnets. By 1840, fewer than 20 patents had been issued to women in the US. The Patent Act of 1790 was technically gender-neutral, but state coverture laws prevented married women from filing patents under their own name. Many inventions by married women were filed under their husband's name and remain effectively uncountable.
The Married Women's Property Acts (passed state by state between 1839 and the late 19th century) gradually removed this barrier. By 1900, women could file in their own name in most US jurisdictions. The early 20th-century numbers therefore represent the floor of measurable women's patenting, not the actual floor of women's inventive activity.
1900-1945: invisible work, slow numbers
The headline numbers
Women's share of US patents in this era is generally reported in single digits at most. The USPTO's historical analysis in Buttons to Biotech (1996, updated 1998) tracked the long arc and identified the period from roughly 1900 to 1940 as essentially flat: women's patenting grew in absolute terms with the overall growth of US patenting but the share remained low and largely unchanging.
What was happening structurally
Women's labor force participation in this era was rising slowly and concentrated in clerical work, teaching, and nursing — categories with limited patent output. The two World Wars drew women temporarily into industrial roles (the most famous being WWII's "Rosie the Riveter" mobilization, when women's share of the US manufacturing workforce briefly approached one-third). Patent filings did not track this surge proportionally, because most wartime industrial work was on the production side rather than the design or invention side.
Notable inventors and the patent system's blind spot
The era produced many widely-used inventions by women that the patent record under-represents. Hedy Lamarr co-invented (with composer George Antheil) a frequency-hopping spread-spectrum communication system in 1941 to help guide Allied torpedoes. The patent issued in 1942 but the technology was not commercially licensed until decades later. Grace Hopper built the A-0 compiler in 1952 and FLOW-MATIC (1959), which became the basis of COBOL, but software was not considered patentable subject matter during her active career.
1945-1972: post-war retrenchment, slow growth
The post-WWII period saw women pushed out of industrial roles as veterans returned to the workforce. Women's share of US patents stayed low. By the late 1960s, USPTO records still show women as roughly 2% of named US patent inventors.
The Civil Rights Act (1964) prohibited employment discrimination on the basis of sex, which over time enabled women's entry into industrial research roles, but the lag from policy change to patent record was long. Most patents in this period attributed to women were in chemistry and the emerging field of biotechnology, where university research had begun admitting women in larger numbers.
1972: Title IX and the pipeline opens
The Education Amendments of 1972 (Title IX) prohibited sex-based discrimination in federally funded education. The immediate effects were on athletics and graduate admissions, but the long-run effect on US patenting was foundational: women's enrollment in STEM doctoral programs roughly tripled between 1970 and 2000, with the steepest growth in biological sciences and chemistry.
The patent record lags the education record by 15-20 years. A doctoral candidate admitted in 1975 reaches peak patenting years in the 1990s. The USPTO's Buttons to Biotech analysis showed exactly this lag: women's share of US patents was still in the low single digits through the late 1970s, then began rising visibly in the late 1980s as the Title IX cohort hit prime research age.
1980: Bayh-Dole and the university tech-transfer boom
The Bayh-Dole Act of 1980 (Public Law 96-517) gave universities and nonprofit research institutions ownership of inventions developed under federal funding. The effect on the US patent system was structural: a wholly new category of patent filer (the university tech transfer office) emerged and grew rapidly. By 2025, Bayh-Dole-attributable filings are widely credited with $1.3 trillion+ of US economic activity and 11,000+ startups.
Bayh-Dole interacted with Title IX in a way that disproportionately helped women patenting numbers. Universities had more gender-balanced researcher pools than industry, and the new TTOs were filing on inventions from those researcher pools. Women's share of new inventor-patentees crept upward through the 1980s and 1990s, from roughly 5% in 1980 to over 17% by 2019.
Stanford's 50-year tech transfer analysis (Tseng et al., Patterns, 2022) documented this trajectory at the institutional level: women's share of Stanford inventors rose from roughly 7% in the mid-1990s to roughly 20% by 2020. The growth was concentrated in biomedical fields, where Stanford's faculty composition was most balanced. It remained substantially below women's share of Stanford faculty overall (~30%+).
1990-2000: the patent boom and a measurable acceleration
The 1990s saw a surge in US patent filings (driven by software, biotech, and the State Street Bank Federal Circuit decision on business method patents in 1998). Women's share of US patents grew measurably for the first time at scale.
USPTO data shows women's share of patents with at least one woman inventor rising from under 10% in the late 1980s to roughly 15% by 2000. The share-weighted women inventor rate rose more slowly. The pattern that defines the modern era was already visible: most of the growth was driven by women joining mixed-gender teams, not by all-women teams growing as a share of total filings.
2000-2020: real growth, structural plateau in all-women teams
Headline movement
Women's overall share of US patents (any inventor) rose from 7.2% in 2000 to 10.9% in 2022 (National Science Board, 2024 indicators). The women inventor rate rose from 12.1% in 2016 to 12.8% in 2019 (USPTO 2020 update). Share of patents with at least one woman inventor rose from 20.7% (2016) to 21.9% (2019). Each metric is up; none is up dramatically.
The flat all-women-team line
The single most stubborn metric over the entire 2000-2020 period is the all-women-team share. Throughout this period, only about 4% of US patents had an all-women inventor team. That number has barely moved in two decades, even as the "at least one woman" rate has grown.
This is the methodological insight that the patent gender gap literature kept rediscovering: the headline progress is real but it is concentrated entirely in women joining male-led mixed teams. The independent women-led invention rate has been essentially flat.
2014: Washington University's WIT program
The most replicable institutional intervention of the period launched in 2014 at Washington University in St. Louis. The Women in Innovation & Technology program (founded by Nichole Mercier) focused on women faculty in biomedical research. Patents filed on behalf of women faculty rose 129% between 2011-13 and 2013-16. Women faculty interactions with the technology transfer office rose 27% over the same window.
2020-2025: pledge era, AI inflection, and the breakthrough penalty
The USIPA Diversity Pledge
The US Intellectual Property Alliance launched its Innovation Diversity Pledge in 2021. By 2025, 50+ companies (including Meta, Microsoft, Google, Lenovo, P&G, Adobe, AT&T, HP, Cisco) had signed; 25+ law firms and universities had joined as supporters. Disclosed company women inventor rates from pledgees ranged from 12-18% as of 2023, with Meta reporting 17.6%.
The Pairolero USPTO randomized controlled trial
Pairolero et al. (American Economic Journal: Economic Policy, 2025) ran the first randomized controlled trial inside the USPTO. Senior examiners trained to assist pro se applicants raised women applicants' probability of receiving a patent by over 12 percentage points. This was the first credible causal evidence that an examiner-side intervention could meaningfully close the grant gap.
The PNAS 2026 unconventional-invention finding
Sowrirajan, Whalen, and Uzzi (PNAS, 2026) analyzed 6.2 million USPTO applications from 2001-2018 and found that the gender gap in US patenting is concentrated in unconventional inventions (those combining patent classification codes in surprising ways). For conventional patents there is no meaningful gap; for highly unconventional patents the gap reaches 14.9 percentage points. See The breakthrough penalty for the full story.
The AI inflection
AI-related patenting grew sharply in this period, with the USPTO's AI Patent Dataset identifying AI content in 13.2 million US patents and pre-grant publications by 2022. Women's participation in AI patenting remained lower than the baseline. See AI's gender gap is becoming an ownership gap.
The pace of change
The arithmetic of 125 years is sobering. The share of US patents with at least one woman inventor moved from roughly 1% in 1900 to 21.9% in 2019. That is approximately 21 percentage points across 12 decades, or just under 2 percentage points per decade in the second half of the timeline where most of the change happened.
At the 2000-2019 pace, gender parity in US inventor-patentees (defined as women equaling 50% of inventors) would arrive around 2090. The WIPO global figure (currently 18.0% as of 2024) is tracking to similar timelines: WIPO's 2023 projection placed global parity at 2061, and that was based on faster growth than the US has shown.