Renewal Rate (First Fee Paid)
Biotechnology and Organic Chemistry
Chemical and Materials Engineering
Computer Architecture Software and Information Security
Semiconductors, Electrical and Optical Systems and Components
Transportation, Electronic Commerce, Construction, and Agriculture
Mechanical Engineering, Manufacturing and Products
The table above reports the percentage of patents for which the first maintenance (renewal) fee was paid. The chart includes patents issued 2005-2007 and the results are grouped according to technology center. It is somewhat interesting to me that TC1600 has the lowest renewal rate.