Patents by Decade
Decade
Count
1840
2
0.1%
1850
8
0.3%
1860
40
1.3%
1870
118
3.8%
1880
214
7.0%
1890
273
8.9%
1900
317
10.3%
1910
533
17.4%
1920
541
17.6%
1930
405
13.2%
1940
318
10.4%
1950
146
4.8%
1960
79
2.6%
1970
52
1.7%
1980
6
0.2%
1990
15
0.5%
2000
1
0.0%