CHATSWORTH, Calif., Aug. 20 -- International Remote Imaging Systems Inc. said that renewed sales growth helped drive revenues up 10 percent during its second quarter ended June 30, 1999. Revenues of $7.4 million were recorded, compared with $6.7 million for the same period a year earlier. For the six months ended June 30, 1999, revenues approached $14.0 million, an increase over the $13.3 million reported for the first half of 1998. The company produces automated in-vitro diagnostic imaging systems and supplies.