You're asking about obtaining a property patta for land purchased by your father in 1983 from a Scheduled Caste (SC) individual. The original allotment was in 1979, with restrictions on sale for 10 years without District Collector permission. If the initial sale to the person your father bought from was invalid due to lack of permission, your father's purchase might also be invalid. Given the time elapsed, you may need to file a declaration suit in court or a suit for mandatory injunction against the tahsildar to get the patta.