Which of the following is true about revised U.S. patent laws?
A) Patents are valid for 17 years after the patent is granted.
B) Patents are valid for 17 years after the patent is filed.
C) Patents are valid for 20 years after the patent is granted.
D) Patents are valid for 20 years after the filing date of the application.
E) Patents are valid as long as the product is manufactured.
Answer: D) Patents are valid for 20 years after the filing date of the application.