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U.S.A. Patent Numbers and ZIP Codes

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KWG Site Map > Home Page > index > U.S.A. Patent Numbers and ZIP Codes

Many domestic knives can be dated by a U.S.A. patent number which happens to be stamped on the blade. This number is the year the patent was granted and not the year the knife was made, but it does help give an approximate date range.

The following USA patent numbers can help you determine the approximate era of manufacture not the exact year:

Year USA Patent Number

1836    1 1840    1,465 1850    6,981 1857    16,324 1865    45,685 1870    98,460 1875    158,350 1880    223,211 1890    418,665 1895    531,619 1900    640,167 1910    945,010 1915    1,123,212

1920    1,326,899 1930    1,742,181 1940    2,185,170 1945    2,366,154 1950    2,494,944 1955    2,698,434 1960    2,919,443 1965    3,163,865 1970    3,487,470 1980    4,180,867 1990    4,890,335 1995    5,377,359 2000    6,009,555

2005    6,836,899

The current USA patent numbering system began with a patent issued on July 13, 1836. Prior to that date 9,957 patents had been issued.

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ZIP Codes started in 1965 in the USA, but not all address information was updated in 1965 to include zip codes. This information can help you determine the approximate era of manufacture not the exact year.

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