Plaintiff pharmaceutical company had received four patents for antibiotic cefaclor in 1980's, which were set to expire between October 1999 and July 2000 — In 1996, defendant pharmaceutical company was advised that it would face infringement action by plaintiff if it entered market with generic version of cefaclor — After defendant filed its first notice of compliance for antibiotic in 1997, it began selling its various capsules of cefaclor on Canadian market — In 1998, defendant entered into new contract with company to have cefaclor be made through new process thereby designing around plaintiff's patent by creating cefaclor 2 — Plaintiff brought successful action against defendant alleging that defendant infringed its patents for manufacture of antibiotic cefaclor