Patents by Decade
Decade
Count
1840
1
0.0%
1850
7
0.2%
1860
39
1.3%
1870
118
4.1%
1880
209
7.2%
1890
260
9.0%
1900
302
10.4%
1910
491
17.0%
1920
496
17.2%
1930
376
13.0%
1940
308
10.7%
1950
140
4.8%
1960
73
2.5%
1970
51
1.8%
1980
5
0.2%
1990
14
0.5%
2000
1
0.0%