Hycor Biomedical Inc., which has been in Garden Grove since its founding in 1981, is moving its headquarters to Indiana, where it will add 12 jobs by the end of the year and as many as 20 jobs by 2013, according to the Indiana Economic Development Corp. Hycor, which manufactures diagnostic products for clinical labs, will keep manufacturing and research and development along with about 115 jobs in Garden Grove, said President and CEO Richard Aderman. The company’s early instruments automated testing for allergies and autoimmune diseases. Now its biggest sellers are in vitro diagnostic products.