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How old is it? Tips to help you determine the age of your antique clock.
Using Patent Numbers to Determine Age: United States Patents


US Patent
Numbers

1 ....
110 ....
546 ....
1,061 ....
1,465 ....
1,923 ....
2,413 ....
2,901 ....
3,395 ....
3,873 ....
4,348 ....
4,914 ....
5,409 ....
5,993 ....
6,981 ....
7,865 ....
8,622 ....
9,512 ....
10,358 ....
12,117 ....
14,009 ....
16,324 ....
19,010 ....
22,477 ....
26,642 ....
31,005 ....
34,045 ....
37,266 ....
41,047 ....
45,685 ....
51,784 ....
60,658 ....
72,959 ....
85,503 ....
98,460 ....
110,617 ....
122,304 ....
134,504 ....
146,120 ....
158,350 ....
171,641 ....
185,813 ....

 


Issue
Date

1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877


US Patent
Numbers

198,733 ....
211,078 ....
223,211 ....
236,137 ....
251,685 ....
269,820 ....
291,016 ....
310,163 ....
333,494 ....
355,291 ....
375,720 ....
395,305 ....
418,665 ....
443,987 ....
466,315 ....
488,976 ....
511,744 ....
531,619 ....
552,502 ....
574,369 ....
596,467 ....
616,871 ....
640,167 ....
664,827 ....
690,385 ....
717,521 ....
748,567 ....
778,834 ....
808,618 ....
839,799 ....
875,679 ....
908,436 ....
945,010 ....
980,178 ....
1,013,095 ....
1,049,326 ....
1,083,267 ....
1,123,212 ....
1,166,419 ....
1,210,389 ....
1,251,458 ....
1,290,027 ....
 


Issue
Date

1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919


US Patent
Numbers

1,326,899 ....
1,364,063 ....
1,401,948 ....
1,440,362 ....
1,478,996 ....
1,521,590 ....
1,568,040 ....
1,612,700 ....
1,654,521 ....
1,696,897 ....
1,742,181 ....
1,787,424 ....
1,839,190 ....
1,892,663 ....
1,941,449 ....
1,985,878 ....
2,026,516 ....
2,066,309 ....
2,104,004 ....
2,142,080 ....
2,185,170 ....
2,227,418 ....
2,268,540 ....
2,307,007 ....
2,338,081 ....
2,366,154 ....
2,391,856 ....
2,413,675 ....
2,433,824 ....
2,457,797 ....
2,492,944 ....
2,536,016 ....
2,580,379 ....
2,624,046 ....
2,664,562 ....
2,698,434 ....
2,728,913 ....
2,775,762 ....
2,818,567 ....
2,866,973 ....
2,919,443 ....
2,966,681 ....


Issue
Date

1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961


US Patent
Numbers

3,015,103 ....
3,070,801 ....
3,116,487 ....
3,163,865 ....
3,226,729 ....
3,295,143 ....
3,360,800 ....
3,419,907 ....
3,487,470 ....
3,551,909 ....
3,631,539 ....
3,707,729 ....
3,781,914 ....
3,858,241 ....
3,930,271 ....
4,000,520 ....
4,065,812 ....
4,131,952 ....
4,180,867 ....
4,242,757 ....
4,308,622 ....
4,366,579 ....
4,423,523 ....
4,490,855 ....
4,562,596 ....
4,633,526 ....
4,716,594 ....
4,794,652 ....
4,890,335 ....
4,980,927 ....
5,077,836 ....
5,175,886 ....
5,274,846 ....
5,377,359 ....
5,479,658 ....
5,590,420 ....
5,704,062 ....
5,855,021 ....
6,009,555 ....
6,167,569 ....


Issue
Date

1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001

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