Here is part of my answer.
Costs for obtaining a patent
http://www.northwestpatent.com/costs.htm
Service My Fee PTO Fee* Notes
prepare patent application $150/hr $100-$2000
provisional application $2000 $100
PAT allowance and issue fee $300 $700 or $1000
PAT maintenance fee: after 3 years $300 $450
PAT maintenance fee: after 7 years $300 $1150
PAT maintenance fee: after 11 years $300 $1900
international (PCT) $600 $2500-$3000
http://answers.google.com/answers/threadview?id=17476
Q: Can 1989 US Patent be reviv...