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| Number | Title | Issue Date |
| 6328104 | Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking A process is disclosed for the in situ conversion and recovery of heavy crude oils and natural bitumens from subsurface formations using either a continuous operation with one or more vertical injection boreholes and one or more vertical production boreho... | 12/11/2001 |
