Dating of Patent Numbers

Many antiques and collectibles are marked with a patent number, this can be a useful asset to help establish a date the item was manufactured. For more information on the patent we offer a search and file delivery service that provides the entire patent document as a downloadable .pdf file.

The US patent number system is a bit confusing, the US Patent Office had issued nearly 10,000 unnumbered patents when a fire destroyed many of the original records in December of 1836. Using private files the office was able to restore 2,845 patents, these documents were numbered with an X prefix. Patent X1 was issued to Sanuel Hopkins for a "Method of Making Potash or Pearl Ash", it was signed by George Washington, Thomas Jefferson was the patent examiner, the date on the patent is July 31, 1790. Patent X2845 the last in this series was issued to Alexander Black for an "Improvemnet in Lamps" on Oct. 3, 1817

Subsequent patents after 1836 were issued starting with #1, a patent which was issued to Senator John Ruggles for his invention of a cog mechanism for locomotive wheels.

1836: 1 - 109
1837: 110 - 545
1838: 546 - 1,105
1839: 1,106 - 1,464
1840: 1,465 - 1,922

1841: 1,923 - 2,412
1842: 2,413 - 2,900
1843: 2,901 - 3,394
1844: 3,395 - 3,872
1845: 3,873 - 4,347
1846: 4,348 - 4,913
1847: 4,914 - 5,408
1848: 5,409 - 5,992
1849: 5,993 - 6,980
1850: 6,981 - 7,864

1851: 7,865 - 8,621
1852: 8,622 - 9,511
1853: 9,512 - 10,357
1854: 10,358 - 12,116
1855: 12,117 - 14,008
1856: 14,009 - 16,323
1857: 16,324 - 19,009
1858: 19,010 - 22,476
1859: 22,477 - 26,641
1860: 26,642 - 31,004

1861: 31,005 - 34,044
1862: 34,045 - 37,265
1863: 37,266 - 41,046
1864: 41,047 - 45,684
1865: 45,685 - 51,783
1866: 51,784 - 60,657
1867: 60,658 - 72,958
1868: 72,959 - 85,502
1869: 85,503 - 98,459
1870: 98,460 - 110,616

1871: 110,617 - 122,303
1872: 122,304 - 134,503
1873: 134,504 - 146,119
1874: 146,120 - 158,349
1875: 158,350 - 171,640
1876: 171,641 - 185,812
1877: 185,813 - 198,732
1878: 198,733 - 211,077
1879: 211,078 - 223,210
1880: 223,211 - 236,136

1881: 236,137 - 251,684
1882: 251,685 - 269,819
1883: 269,820 - 291,015
1884: 291,916 - 310,162
1885: 310,163 - 333,493
1886: 333,494 - 355,290
1887: 355,291 - 375,719
1888: 375,720 - 395,304
1889: 395,305 - 418,664
1890: 418,665 - 443,986

1891: 443,987 - 466,314
1892: 466,315 - 488,975
1893: 488,976 - 511,743
1894: 511,744 - 531,618
1895: 531,619 - 552,501
1896: 552,502 - 574,368
1897: 574,369 - 596,466
1898: 596,467 - 616,870
1899 : 616,871 - 640,166
1900 : 640,167 - 664,826

1901: 664,827 - 690,384
1902: 690,385 - 717,520
1903: 717,521 - 748,566
1904: 748,567 - 778,833
1905: 778,834 - 808,617
1906: 808,618 - 839,798
1907: 839,799 - 875,678
1908: 875,679 - 908,435
1909: 908,436 - 945,009
1910: 945,010 - 980,177

1911: 980,178 - 1,013,094
1912: 1,013,095 - 1,049,325
1913: 1,049,326 - 1,083,266
1914: 1,083,267 - 1,123,211
1915: 1,123,212 - 1,166,418
1916: 1,166,419 - 1,210,388
1917: 1,210,389 - 1,251,457
1918: 1,251,458 - 1,290,026
1919: 1,290,027 - 1,326,898
1920: 1,326,899 - 1,364,062

1921: 1,364,063 - 1,401,947
1922: 1,401,948 - 1,440,361
1923: 1,440,362 - 1,478,995
1924: 1,478,996 - 1,521,589
1925: 1,521,590 - 1,568,039
1926: 1,568,040 - 1,612,699
1927: 1,612,700 - 1,654,520
1928: 1,654,521 - 1,696,896
1929: 1,696,897 - 1,742,180
1930: 1,742,181 - 1,787,423

1931: 1,787,424 - 1,839,189
1932: 1,839,190 - 1,892,662
1933: 1,892,663 - 1,941,448
1934: 1,941,449 - 1,985,877
1935: 1,985,878 - 2,026,515
1936: 2,026,516 - 2,066,308
1937: 2,066,309 - 2,104,003
1938: 2,104,004 - 2,142,079
1939: 2,142,080 - 2,185,169
1940: 2,185,170 - 2,227,417

1941: 2,227,418 - 2,268,539
1942: 2,268,540 - 2,307,006
1943: 2,307,007 - 2,338,080
1944: 2,338,081 - 2,366,153
1945: 2,366,154 - 2,391,855
1946: 2,391,856 - 2,413,674
1947: 2,413,675 - 2,433,823
1948: 2,433,824 - 2,457,796
1949: 2,457,797 - 2,492,943
1950: 2,492,944 - 2,536,015

1951: 2,536,016 - 2,580,378
1952: 2,580,379 - 2,624,045
1953: 2,624,046 - 2,664,561
1954: 2,664,562 - 2,698,433
1955: 2,698,434 - 2,728,912
1956: 2,728,913 - 2,775,761
1957: 2,775,762 - 2,818,566
1958: 2,818,567 - 2,866,972
1959: 2,866,973 - 2,919,442
1960: 2,919,443 - 2,966,680

1961: 2,966,681 - 3,015,102
1962: 3,015,103 - 3,070,800
1963: 3,070,801 - 3,116,486
1964: 3,116,487 - 3,163,864
1965: 3,163,865 - 3,226,728
1966: 3,226,729 - 3,295,142
1967: 3,295,143 - 3,360,799
1968: 3,360,800 - 3,419,906
1969: 3,419,907 - 3,487,469
1970: 3,487,470 - 3,551,908

1971: 3,551,909 - 3,631,538
1972: 3,631,539 - 3,707,728
1973: 3,707,729 - 3,781,913
1974: 3,781,914 - 3,858,240
1975: 3,858,241 - 3,930,270
1976: 3,930,271 - 4,000,519
1977: 4,000,520 - 4,065,811
1978: 4,065,812 - 4,131,951
1979: 4,131,952 - 4,180,866
1980: 4,180,867 - 4,242,756

1981: 4,242,757 - 4,308,621
1982: 4,308,622 - 4,366,578
1983: 4,366,579 - 4,423,522
1984: 4,423,523 - 4,490,884
1985: 4,490,885 - 4,562,595
1986: 4,562,596 - 4,633,525
1987: 4,633,526 - 4,716,593
1988: 4,716,594 - 4,794,651
1989: 4,794,652 - 4,890,334
1990: 4,890,335 - 4,980,926

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