Treatment of underground beds
Patent 4442896 Issued on April 17, 1984. Estimated Expiration Date: 
July 21, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 21, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2796129 Apparatus and process for drilling underground arcuate paths utilizing directional drill and following liner Method of and apparatus for measuring the deviation of the center axis of bore holes and trenches relative to the design vertical center axis thereof Patent #: 4214374 InventorsApplicationNo. 06/400323 filed on 07/21/1982US Classes:166/278, Graveling or filter forming166/50, WELLS WITH LATERAL CONDUITS299/35Wire saw-type cutterExaminersPrimary: Novosad, Stephen J.Assistant: Starinsky, Michael Attorney, Agent or FirmInternational ClassesE21B 43/02 (20060101)E21B 43/04 (20060101) E21B 43/00 (20060101) E21B 43/25 (20060101) E21B 43/247 (20060101) E21B 43/30 (20060101) E21B 43/26 (20060101) E21B 43/16 (20060101) E21B 29/00 (20060101) AbstractA method of preparing an underground bed for treatment. A channel is formed in the bed extending from the ground down through the bed and up to the ground. A cutting device is inserted into the channel operated to form a pathway in a substantially vertical plane. | |
