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Guide to Marks and Dating
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Introduction
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Patent Numbers
British Patent Numbers
1916-1981
US Patent Numbers
1836-2000

 
US Patent Guide 1836-1951
Year Utility Design Reissue
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
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
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
              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
   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
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

 
 
 
 
 

          D1
        D15
        D27
        D44
      D103
      D163
      D209
      D258
      D341
      D431
      D540
      D626
      D683
      D753
      D860
      D973
    D1075
    D1183
    D1366
    D1508
    D1703
    D1879
    D2018
    D2239
    D2533
    D2858
    D3304
    D3810
    D4547
    D5452
    D6336
    D7083
    D7969
    D8884
    D9686
  D10385
  D10975
  D11567
  D12082
  D12647
  D13508
  D14528
  D15678
  D16451
  D17046
  D17995
  D18830
  D19553
  D20439
  D21275
  D22092
  D22994
  D23922
  D25037
  D26482
  D28113
  D29916
  D32055
  D33813
  D35547
  D36187
  D36723
  D37280
  D37766
  D38391
  D38980
  D39737
  D40424
  D41063
  D42073
  D43415
  D45098
  D46813
  D48358
  D50117
  D51629
  D52836
  D54359
  D56844
  D60121
  D61748
  D63675
  D66346
  D69170
  D71772
  D74159
  D77347
  D80254
  D82966
  D85903
  D88847
  D91258
  D94179
  D98045
D102601
D107738
D112765
D118358
D124503
D130989
D134717
D136946
D139862
D143386
D146165
D148267
D152235
D156686
D161404


 
 
 

RE00030
RE00036
RE00049
RE00060
RE00067
RE00078
RE00091
RE00105
RE00128
RE00158
RE00184
RE00209
RE00229
RE00258
RE00286
RE00337
RE00420
RE00517
RE00643
RE00874
RE01106
RE01253
RE01369
RE01596
RE01844
RE02140
RE02430
RE02830
RE03250
RE03784
RE04223
RE04687
RE05216
RE05717
RE06200
RE06831
RE07452
RE08020
RE08529
RE09017
RE09523
RE09994
RE10265
RE10432
RE10548
RE10677
RE10793
RE10892
RE10978
RE11053
RE11137
RE11217
RE11298
RE11397
RE11461
RE11520
RE11581
RE11646
RE11706
RE11798
RE11879
RE11960
RE12070
RE12189
RE12299
RE12428
RE12587
RE12738
RE12906
RE13066
RE13189
RE13346
RE13504
RE13668
RE13858
RE14040
RE14238
RE14417
RE14582
RE14785
RE15018
RE15257
RE15513
RE15739
RE15974
RE16240
RE16515
RE16841
RE17176
RE17550
RE17917
RE18312
RE18705
RE19038
RE19409
RE19804
RE20226
RE20610
RE20959
RE21311
RE21683
RE21992
RE22242
RE22415
RE22585
RE22706
RE22827
RE22957
RE23068
RE23186
RE23315

Notes: Utility patents were valid for 17 years up to those issued in 1995, Design patents are valid for 14 years, and Reissue patents are valid for the period covered by the original patent (i.e., they don't extend patent protection). Defensive Publication (DEF) patents and Statutory Invention Registration (SIR) patents are of little interest to the collector, because they were introduced in 1968(?) and 1985, respectively.
Recommended reference: TAF Report: Issue Dates and Patent Numbers Since 1836 (U.S. Patent and Trademark Office).

About this Page

It seems that everybody is selling something on the Internet and few sites provide any free information about antiques and collectibles. Well, we sell things too but we also provide some free information about the items we sell and collect. This page is designed to provide a quick reference for the experienced collector in identifying and dating some items. It is not intended to be a definitive guide but only a quick reference (This information should not be used as a buying or selling guide.). The information provided is accurate to the best of our knowledge; however, the user should consult the standard reference sources for confirmation of this information -- we assume no liability for the information provided herein. Indeed, the references we consult often conflict in identifying and dating items.

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Last revised: 16 July 2001 11:17 EDT
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