You can also try United States Patent and Trademark Office
it is free.
I would also send yourself a certified envelope w/return receipt. I would include a letter to yourself with designs and pictures. DO NOT OPEN IT!!!
You will walk out of the Post Office with a stamped receipt for the mailing.
You will sign the green card when the mailman delivers it the next day.
The PO will mail the green card back to you a few days later.
Put everything in a safe place.
The reason behind this is. If you have to defend that it was your idea and when you came up with the design. Poor mans insurance policy.
Hope this helps. Hitch :king: