Patent Terms Extended Under 35 U.S.C.   156

   A certificate extending the term of the following patent was issued on
April 16, 1999.

   U.S. Patent No. Re. 34,440: Granted November 9, 1993, to Braham Shroot
et al.; Owner of Record: Centre International de Recherches
Dermatologiques; Title: Benzonaphthalene Derivatives, A Process of Their
Preparation and their use in Therapeutic and Cosmetic Compositions;
Classification 514/62; Product Trade Name: DIFFERIN Topical Gel
(adapalene); Original Expiration Date: March 24, 2009; Term Extended:
433 days.

   U.S. Patent No. 4,717,720; Granted January 5, 1988, to Braham Shroot et
al.; Owner of Record: Centre International de Recherches
Dermatologiques; Title: Benzonaphthalene Derivatives and Compositions;
Classification: 514/63; Product Trade Name: DIFFERIN Solution
(adapalene); Original Expiration Date: April 10, 2006; Term Extended:
1,512 days.

   U.S. Patent No. 5,047,407; Granted September 10, 1991, to Bernard
Belleau; Owner of Record: BioChem Pharma Inc.; Title:
2-Substituted-5-Substituted-1,3-Oxathiolanes with Antiviral Properties;
Classification: 514/274; Product Trade Name: EPIVIRĖtm (lamivudine);
Original Expiration Date: February 8, 2009; Term Extended: 282 days.