US Patent Numbers/Dates


Patent Numbers
From Date
To Date
1 1,922
   
pre 1841
1,923 2,400
Jan 1841
Dec 1841
2,401 4,910
Jan 1842
Dec 1846
4,911 8,620
Jan 1847
Dec 1851
8,621 12,160
Jan 1852
Jan 1855
12,161 22,430
Feb 1855
Dec 1858
22,431 31,230
Jan 1859
Jan 1861
31,231 35,290
Feb 1861
May 1862
35,291 37,650
Jun 1862
Feb 1863
37,651 45,600
Mar 1863
Dec 1864
45,601 49,260
Jan 1865
Aug 1865
49,261 73,250
Sep 1865
Jan 1868
73,251 134,400
Feb 1868
Dec 1872
134,401 172,300
Jan 1873
Jan 1876
172,300 241,100
Feb 1876
May 1881
241,101 338,200
Jun 1881
Mar 1886
338,201 418,250
Apr 1886
Dec 1889
418,251 478,660
Jan 1890
Jul 1892
478,661 533,280
Aug 1892
Jan 1895
533,281 610,900
Feb 1895
Sep 1898
610,901 639,560
Oct 1898
Dec 1899
639,561 673,050
Jan 1900
May 1901
673,051 797,700
Jun 1901
Aug 1905
797,701 979,180
Sep 1905
Dec 1910
979,181 1,152,100
Jan 1911
Aug 1915
1,152,101 1,352,120
Sep 1915
Sep 1920
1,352,121 1,707,440
Oct 1920
Apr 1929
1,707,441 1,839,180
May 1929
Dec 1931
1,839,181 2,066,300
Jan 1932
Dec 1936
2,066,301 2,268,540
Jan 1937
Jan 1942
2,268,541 2,413,670
Feb 1942
Dec 1946
2,413,671 2,580,380
Jan 1947
Jan 1952
2,580,381 2,775,760
Feb 1952
Dec 1956
2,775,761 3,015,100
Jan 1957
Dec 1961
3,015,101 3,295,150
Jan 1962
Jan 1967
3,295,151 3,631,540
Feb 1967
Jan 1972
3,631,541 3,873,830
Feb 1972
Mar 1975
3,873,831 4,134,130
Apr 1975
Jan 1979
4,134,131 4,471,450
Feb 1979
Sep 1984
4,471,451 4,881,020
Oct 1984
Nov 1989
4,881,021 5,218,270
Dec 1989
Jun 1993
5,218,271 5,525,900
Jul 1993
Jun 1996