Articles: Patent Numbers & Dates

The following list is provided as a guide to help identify items where knowledge of the Patent Number can be useful in narrowing the period of when the item was manufactured and/or made available for sale.
Below you will find a selected series of Patent Numbers and the corresponding Month and Year within which it was issued.

1,922........pre 1841
2,400........Dec 1841
4,910........Dec 1846
8,620........Dec 1851
12,160........Jan 1855
22,430........Dec 1858
31,230........Jan 1861
35,290........May 1862
37,650........Feb 1863
45,600........Dec 1864
49,260........Aug 1865
73,250........Jan 1868
134,400........Dec 1872
172,300........Jan 1876

241,100........May 1881
338,200........Mar 1886
418,250........Dec 1889
478,660........Jul 1892
533,280........Jan 1895
610,900........Sep 1898
639,560........Dec 1899
673,050........May 1901
797,700........Aug 1905
979,180........Dec 1910
1,152,100........Aug 1915
1,352,120........Sep 1920
1,707,440........Apr 1929
1,839,180........Dec 1931

2,066,300........Dec 1936
2,268,540........Jan 1942
2,413,670........Dec 1946
2,580,380........Jan 1952
2,775,760........Dec 1956
3,015,100........Dec 1961
3,295,150........Jan 1967
3,631,540........Jan 1972
3,873,830........Mar 1975
4,134,130........Jan 1979
4,471,450........Sep 1984
4,881,020........Nov 1989
5,218,270........Jun 1993
5,525,900........Jun 1996

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