two main kinds "1502 Definition of a Design [R-08.2012]" utility patents "1502 Definition of a Design [R-08.2012]" https://www.uspto.gov/web/offices/pac/mpep/s1502.html "1502 Definition of a Design [R-08.2012]" https://www.uspto.gov/web/offices/pac/mpep/s1502.html "1502 Definition of a Design [R-08.2012]" "1502 Definition of a Design [R-08.2012]" design patent design patent MPEP 1502.01 https://www.uspto.gov/web/offices/pac/mpep/s1502.html distinct from a utility patent "1502 Definition of a Design [R-08.2012]" utility patents