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Bill Polkinghorn

Contact Information

Telephone 301 952 1011 (office)

Cellular 301 318 1845

williampolkinghorn@mac.com

Books

• Patent It Yourself

• Patent, Copyrights & Trademark for Dummies

• Patent Pending in 24 hour

• Inventor's Notebook: A Patent It Yourself Companion

• Manual of Patent Examining Procedure

• Manual of Classification

© William Polkinghorn 2020