U. S. 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.)

YearStarting # YearStarting # YearStarting # YearStarting # YearStarting #
183611837110183854618391,06118401,465
18411,92318422,41318432,90118443,39518453,873
18464,34818474,91418485,40918495,99318506,981
18517,86518528,62218539,512185410,358185512,117
185614,009185716,324185819,010185922,477186026,642
186131,005186234,045186337,266186441,047186545,685
186651,784186760,658186872,959186985,503187098,460
1871110,6171872122,3041873134,5041874146,1201875158,350
1876171,6411877185,8131878198,7331879211,0781880223,211
1881236,1371882251,6851883269,8201884291,0161885310,163
1886333,4941887355,2911888375,7201889395,3051890418,665
1891443,9871892466,3151893488,9761894511,7441895531,619
1896552,5021897574,3691898596,4671899616,8711900640,167
1901664,8271902690,3851903717.5211904748,5671905778,834
1906808,6181907839,7991908875,6791909908,4361910945,010
1911980,17819121,013,09519131,049,32619141,083,26719151,123,212
19161,166,41919171,210,38919181,251,45819191,290,02719201,326,899
19211,364,06319221,401,94819231,440,36219241,478,99619251,521,590
19261,568,04019271,612,70019281,654,52119291,696,89719301,742,181
19311,787,42419321,839,19019331,892,66319341,941,44919351,985,878
19362,026,51619372,066,30919382,104,00419392,142,08019402,185,170
19412,227,41819422,268,54019432,307,00719442,338,08119452,366,154
19462,391,85619472,413,67519482,433,82419492,457,79719502,492,944
19512,536,01619522,580,37919532,624,04619542,664,56219552,698,434
19562,728,91319572,775,76219582,818,56719592,866,97319602,919,443
19612,966,68119623,015,10319633,070,80119643,116,48719653,163,865
19663,226,72919673,295,14319683,360,80019693,419,90719703,487,470
19713,551,90919723,631,53919733,707,72919743,781,91419753,858,241
19763,930,27119774,000,52019784,065,81219794,131,95219804,180,867
19814,242,75719824,308,62219834,366,57919844,423,52319854,490,885
19864,562,59619874,633,52619884,716,59419894,794,65219904,890,335
19914,980,92719925,077,83619935,175,88619945,274,84619955,377,359
19965,479,65819975,589,86019985,704,06219995,855,02120006,009,555
20016,167,56920026,334,22020036,502,24420046,671,88420056,836,899
20066,981,28220077,155,74620087,313,82920092010

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