11.   Brazilian patent law is based on the first-to-file principle, meaning whoever first applies for a patent will be its owner if it is granted.

12.   Budding scientists can load up the Periodic Table of the Elements, a metric converter and a guide to patent law.

13.   But Cipla cannot legally sell the drug in many African countries, which have Western-style patent laws.

14.   But companies that have been paying Columbia to use the patent say the extension is unfair because it circumvents patent law and would set a bad precedent.

15.   But Congress, he said, had not had a good reason for bringing states under the patent laws.

16.   But Infigen claims it started attempting to clone an animal before the Roslin team, an important distinction in the arcane sphere of patent law.

17.   But he does, and he is determined to use his stewardship of that office to reshape patent laws that have prevailed since the Civil War.

18.   But it represents one of the most radical changes in U.S. patent law in a century.

19.   But patent law will have to be revised and strengthened in the biotech age, some lawyers say.

20.   But pharmaceutical companies and other research institutions in the United States and Europe say that none of their activities are illegal under Brazilian or international patent law.