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1848-08-10 was a Thursday not a Tuesday

Starting in 1848 US patents were generally issued on Tuesdays. The following is a list of dates which do not follow this rule:

This error message will be generated if you search for a date after January 1, 1848 that isn't a Tuesday or a known exception listed above.

There are a handful of non US patents in the datamp database. They may not follow the Tuesday rules above. Click here to display the non US patents.

More Patent Date: help