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The number for each year is the first design patent issued that year. Design patents refer to any new ornamental design for an item.
Send questions about USPTO programs and services to the USPTO Contact Center(UCC).
You can also obtain classification numbers at "Tools to Help in Searching by Patent Classification" at step 3.
You now have a list of patents of a particular class for the range of years you have specified, and they will be in chronological order based on the date of the Tuesday of the week in which the patent was granted.
The design patent protects only the appearance of an article, but not its structural or functional features.
Inventors are encouraged to search the USPTO's patent database to see if a patent has already been filed or granted that is similar to your patent.