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Step 4 - Search the Patent Database for similar patents. Since you now have the class and sub-class numbers you can even find patents back to 1790!
Step 5 - Use either the Patent Database or the Official Gazette (C 21.5:)
Use Patent Database or the Official Gazette in print (C 21.5:). Carefully read the patents and patent abstracts to see if they are similar to what you've invented. Request full texts from VCU via InterLibrary Loan as appropriate.