Collectors.Org: U. S. Invention Patent Dates

U. S. Invention Patent Dates

Invention patent numbers, often found imprinted or stamped on items, or pieces of items, can often be a major clue in dating the item. Remember, however, that patent date does not mean manufactured date. Use the patent number/date only as a guide. (An invention patent is in effect, with exclusive rights for the inventor, for 17 years from date of issuance.)

Patent	Date	Patent	Date	Patent	Date	Patent	Date	Patent	Date
		1	1836	110	1837	546	1838	1,061	1839
1,465	1840	1,923	1841	2,413	1842	2,901	1843	3,395	1844
3,873	1845	4,348	1846	4,914	1847	5,409	1848	5,993	1849
6,981	1850	7,865	1851	8,622	1852	9,512	1853	10,358	1854
12,117	1855	14,009	1856	16,324	1857	19,010	1858	22,477	1859
26,642	1860	31,005	1861	34,045	1862	37,266	1863	41,047	1864
45,685	1865	51,784	1866	60,658	1867	72,959	1868	85,503	1869
98,460	1870	110,617	1871	122,304	1872	134,504	1873	146,120	1874
158,350	1875	171,641	1876	185,813	1877	198,733	1878	211,078	1879
223,211	1880	236,137	1881	251,685	1882	269,820	1883	291,016	1884
310,163	1885	333,494	1886	355,291	1887	375,720	1888	395,305	1889
418,665	1890	443,987	1891	466,315	1892	488,976	1893	511,744	1894
531,619	1895	552,502	1896	574,369	1897	596,467	1898	616,871	1899
640,167	1900	664,827	1901	690,385	1902	717.521	1903	748,567	1904
778,834	1905	808,618	1906	839,799	1907	875,679	1908	908,436	1909
945,010	1910	980,178	1911	1,013,095	1912	1,049,326	1913	1,083,267	1914
1,123,212	1915	1,166,419	1916	1,210,389	1917	1,251,458	1918	1,290,027	1919
1,326,899	1920	1,364,063	1921	1,401,948	1922	1,440,362	1923	1,478,996	1924
1,521,590	1925	1,568,040	1926	1,612,700	1927	1,654,521	1928	1,696,897	1929
1,742,181	1930	1,787,424	1931	1,839,190	1932	1,892,663	1933	1,941,449	1934
1,985,878	1935	2,026,516	1936	2,066,309	1937	2,104,004	1938	2,142,080	1939
2,185,170	1940	2,227,418	1941	2,268,540	1942	2,307,007	1943	2,338,081	1944
2,366,154	1945	2,391,856	1946	2,413,675	1947	2,433,824	1948	2,457,797	1949
2,492,944	1950	2,536,016	1951	2,580,379	1952	2,624,046	1953	2,664,562	1954
2,698,434	1955	2,728,913	1956	2,775,762	1957	2,818,567	1958	2,866,973	1959
2,919,443	1960	2,966,681	1961	3,015,103	1962	3,070,801	1963	3,116,487	1964
3,163,865	1965	3,226,729	1966	3,295,143	1967	3,360,800	1968	3,419,907	1969
3,487,470	1970	3,551,909	1971	3,631,539	1972	3,707,729	1973	3,781,914	1974
3,858,241	1975	3,930,271	1976	4,000,520	1977	4,065,812	1978	4,131,952	1979
4,180,867	1980	4,242,757	1981	4,308,622	1982	4,366,579	1983	4,423,523	1984
4,490,885	1985	4,562,596	1986	4,633,526	1987	4,716,594	1988	4,794,652	1989
4,890,335	1990	4,980,927	1991	5,077,836	1992	5,175,886	1993	5,274,846	1994
5,377,359	1995	5,479,658	1996	5,589,860	1997	5,704,062	1998	5,855,021	1999
6,009,555	2000	6,167,569	2001