Compare your logo to registered and unregistered trademarks in the USPTO and your state's databases. Alter your logo if it is similar enough to another mark as to create a “likelihood of confusion” for the public that your goods are related to those of another entity.
Use your logo throughout the geographic region in which you sell goods to establish the area in which you are asserting your exclusive rights.
Apply for trademark protection in accordance with the laws of each state where you are using, or intend to use, your logo in commerce. Provide the date you first used the logo in that state, a drawing of the logo and a description of the goods to which you are connecting the mark.
Apply to the USPTO for federal trademark protection of the logo you are using, or intend to use, if you sell goods to someone in a state other than the state where your business is located. Apply by submitting a drawing of the logo, statement identifying the goods to which the mark will apply, and payment of the appropriate fees.
Protect your trademark by reviewing advertisements and brochures to see if any of your competitors are using your logo. Quickly contact any company that uses your logo and insist the usage stop. Use your trademark only in connection with the goods to which the trademark pertains. Use your trademark in some form of advertising every year. Renew your federal and state registrations within the designated time periods.