1. Behringwerke Aktiengesellschaft (5 from 340 patents)

2. Laboratoires Hoechst S/a (4 from 7 patents)

3. Cemaf (3 from 3 patents)

4. Laboratories Besins Iscovesco (2 from 2 patents)

5. Other (1 from 832,912 patents)

6. Hoechst Aktiengesellschaft (1 from 6,662 patents)

7. Atochem (1 from 336 patents)

8. Pierre Fabre Medicament (1 from 266 patents)

9. P C U K Produits Chimiques Ugine Kuhlmann (1 from 51 patents)

10. Laboratories Hoechst S.a. (1 from 2 patents)

11. Macef (1 from 1 patent)

12. Cemaf and Laboratories Besins Isovesco S.a. (1 from 1 patent)

13. Laboratories Besins-Iscovesco S.a. (1 from 1 patent)

14. Laboratoires Hoechst (1 from 1 patent)

15. Cemaf and Laboratoires Besins Iscovesco S.a. (1 from 1 patent)

1. 7291627 - Dihydroimidazo[5.1-a]-beta-carboline derivatives, method for their preparation, and their application as a drug

2. 6335346 - Pyrrolo-(3,4-b)quinoline derivatives, method for the production and use thereof as a medicament

3. 6146658 - Prodrugs, their preparation and use as pharmaceuticals

4. 6140372 - Acyl derivatives of melatonin and of melatoninergic analogues and their

5. 6066663 - Oxidation derivatives of indolylalkylamines and their use as drugs

6. 6048868 - Melatonin-antagonist .beta.-carboline derivatives and analogues thereof

7. 6004991 - Acylated derivatives of melationin and its analogues, useful as

8. 5955100 - Prodrugs their preparation and use as pharmaceuticals

9. 5877158 - Pro-prodrugs, their production and use

10. 5763471 - Melatoninergic agonist spiro �indolepyrrolidine! derivatives, process

11. 5620985 - Antimitotic binary alkaloid derivatives from catharanthus roseus

12. 5621002 - Prodrugs for enzyme mediated activation

13. 5561119 - Glycosylated prodrugs, their method of preparation and their uses

14. 4789665 - Anthracyclines and drugs containing them

15. 4731468 - Aglycons