Date field for Patents

The Patent Item has a field for "Date", one for "Date Issued" and one for "Accessed".
The Date field does not appear to get mapped (issued is mapped to Date Issued) and it creates confusion as here:
http://forums.zotero.org/discussion/9094/citation-of-authors-names-and-of-patents/#Item_5

If the patent is converted to another type, however, the date field, rather than the "Date Issued" field is moved to that items Date field.

I think "Date" should be removed from patents.

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