Patent Date Table 1836-1990

Sometimes folks will just make a wild stab or guess at when an item might have been made, even though a more reliable way to estimate age is available to them if the piece has a patent number printed on it.

The US Patent Office opened for business in 1836, and since that time people with great ideas for useful tools or nifty gadgets have been obtaining patents for those items.

If a number can be found stamped into or onto an antique or collectible piece, very often this number will be an invention patent number. If you are able to determine which patent category the number corresponds to: invention, design or trademark; you can then go to a patent date chart for that category and use the number to find the year the patent was granted. If the word or abbreviation for 'Patent' is printed with the number, the table that follows can be used. Sometimes a design patent will be preceded either by the word 'Design' or with the letter 'D'. A table for design patents will be posted separately.

In general the table below should help to closely approximate the period when the item was made. Keep in mind the number can only reveal a period of time in which the item was most likely made, and this date may not be the exact year of manufacture. This is because an item could have been made after the date the patent number was granted, within a set span of years. In 1995, as part of the GATT Treaty, the U.S. Patent and Trademark Office made a change to the U.S. Patent System in reference to the duration of time associated with a patent. For US Patents filed before June 8, 1995, the term of the patent was the longer of 17 years from the date of issuance or 20 years from the date of filing. For applications filed after June 8, 1995, the term is now 20 years from the date of filing.

Because our primary interest in patent numbers when dealing with antiques and collectibles is generally for dates long before 1995, using a span of 20 years after the date of issuance of a patent for dating purposes is considered a safe extrapolation for the circa date of an item marked with a patent number, if no other information related to the item indicates a specific year.

It is sometimes a good idea, too, to check to see if any extensions might have been granted which would extend the life of the original patent. If you want to check for extensions on a patent or do more in-depth research on your item, perhaps to determine who the original patent was registered to or to view the original drawings, you can do so by visiting the United States Patent and Trademark Office online: http://www.uspto.gov/.

Collectors usually revel in the history of the objects they collect. Being able to offer them accurate and interesting information, such as information about an original utility or design patent, is a plus to have the information at your disposal.

Patent Date Table 1836 -1990

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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