Design Patent Law is complicated - and should be done by an experienced practitioner. Visit the Patent Office website - www.uspto.gov - and check out some design patents and guidelines related to them. It would be unusual for a patent attorney to waive fees and become an investor. Check out the "pro bono" program at the USPTO - you may qualify for free services. GOOD LUCK!
Answered on May 15th, 2015 at 4:16 PM