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| Number | Title | Issue Date |
| 7341120 | Blade edge structure for core drill A cutting portion structure of a core drill having diamond grains may affect deformation of a tip end portion of a cutting blade after extended use. A core drill A comprises cutting blades 2 formed at an opening end portion 4 of a cylindrical core body... | 03/11/2008 |
| 6116358 | Core sampler A core sampler, particularly for use in oil prospecting, including a flexible movable ring (5), provided in particular at the front end (2) of the core sampler, which end is connected to a coring bit (3), for grasping a core sample (C) to be brought to th... | 09/12/2000 |
| 4552229 | Externally powered core catcher A mechanism for catching and holding a core within an inner tube in a drill string includes a slidable core catcher and a full closure core catcher. The slidable core catcher is disposed within the inner tube and is coupled to an inner tube ring concentri... | 11/12/1985 |
| 4296822 | Multipurpose fluid flow assisted downhole tool A multipurpose fluid flow assisted downhole tool that is adapted for attachment to the lower end of a pipe string to be extended into a well bore and which is capable of cutting sample cores from subsurface earth formations and removing the cores for eval... | 10/27/1981 |
| 3964555 | Apparatus for obtaining earth cores An apparatus for obtaining earth samples of soil or rock from the bottom of holes previously drilled in the earth, the apparatus having an outer and inner non-rotatable casing and a rotatable intermediate casing wherein the intermediate casing is provided... | 06/22/1976 |
