1947-08-02 was a Saturday 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:
- 1849-03-10, a Saturday, was an issue date.
- 1850-12-31, a Tuesday, was not an issue date.
- 1851-01-01, a Wednesday, was an issue date.
- 1875-10-11, a Monday, was an issue date.
- 1875-10-12, a Tuesday, was not an issue date.
- 1971-06-28, a Monday, was an issue date.
- 1971-09-20, a Monday, was an issue date.
- 1974-06-28, a Friday, was an issue date.
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