DUPONT UNIT RAISES CRUDE OIL POSTINGS Conoco Inc, a subsidiary of duPont deNemours <DD>, said it raised the contract price it will pay for all grades of crude oil 50 cts a barrel, effective yesterday. The increase brings Conoco's posted price for West Texas Intermediate to 19.00 dlrs a barrel. The West Texas Sour grade, at 34 API, now stands at 18.10 dlrs a barrel. Light Louisiana was also raised 50 cts to 19.35 dlrs barrel. Conoco last changed its crude postings on May 21.