Design patents are hard to guard against, practical tutorial on the steps of searching for design patents in the United States and the European Union (verified)

step:

Click Advanced Search =》Enter keywords in the first input box,

Don't click search immediately.

The second row of input boxes selects the region (country),

Then scroll to the end and search.

Filter data on the left side of the search results page.

http://patft.uspto.gov/netahtml/PTO/search-bool.html

step:

Enter the number 4 in Term 1, select application type in Field 1,

Fill in the keywords in Term 2, and set Field 2 to search by default.

U.S. design patent numbers all begin with D.