US Patent Numbers and Their Dates
1850 6,981 |
1855 12,601 |
1860 25,279 |
1865 48,969 |
1870 98,471 |
1875 158,350 |
1880 232,978 |
1885 310,163 |
1890 418,655 |
1895 531,619 |
1900 640,167 |
1905 778,834 |
1910 945,010 |
1915 1,128,212 |
1920 1,326,899 |
1925 1,521,590 |
1930 1,742,181 |
1935 1,985,878 |
1940 2,185,170 |
1945 2,366,154 |
1950 2,492,944 |
1955 2,689,434 |
1960 2,919,443 |
1965 3,163,865 |
1970 3,487,470 |
1975 3,858,241 |
1980 |
1985 |
1990 |
1995 |
2000 |
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English System vs. Metric System
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