International Business Machines Corp. and Motorola Inc....

International Business Machines Corp. and Motorola Inc. said they signed an agreement for Motorola to participate in an IBM research and development effort on the use of X-rays in producing semiconductors . . . Continental Bank Corp. of Chicago announced an increase in its fourth-quarter common stock dividend to 25 cents from 20 cents . . . El Monte-based Birtcher Corp. said it signed a definitive agreement with C.R. Bard Inc. for the purchase of its Denver-based Bard/EMS electrosurgery division for about $11 million in cash . . . Marina State Bank, with headquarters in Marina del Rey, has entered into a preliminary agreement to be acquired by Paolo Orlandi, an individual, for about $2.5 million, Chairman Rowan Henry announced.