The PTO may ask a question pertaining to the differences between design patents and utility patents. Be careful when answering any question about patent terms, they may sneak design patents in a choice hoping you won't notice. The PTO will most likely ask at least one question on the elements of an application and their proper order, sometimes they will choose design patents for this question.

Facts about design patents:
1. the term is 14 years from date of grant
2. there is no maintenance fee
3. only one claim is present
4. distinct invention is mandatory
5. may not file under PCT
6. period of foreign priority only 6 months
7. may not file a provisional application