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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.


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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