Binder-injecting rockbolt
Patent 4655644 Issued on April 7, 1987. Estimated Expiration Date: 
June 6, 2004. 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.
June 6, 2004. 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 2092341 2287395 2849866 2950602 3308505 3359742 3507121 3613495 Anchor rod for walls, bulkheads and the like Unitary drill bit and roof bolt InventorsApplicationNo. 06/617884 filed on 06/06/1984US Classes:405/259.5, With settable material feature405/259.3, Expandable tube411/44Including sleeve and distinct tapered expander (e.g., anchor bolt type)ExaminersPrimary: Corbin, David H.Attorney, Agent or FirmInternational ClassesE21D 20/00 (20060101)E21D 20/02 (20060101) E21D 21/00 (20060101) F16B 13/14 (20060101) F16B 13/00 (20060101) AbstractA rockbolt for installation in a bore in the roof of an underground excavation for supporting a roof, the rockbolt comprising a sleeve and a central member axially disposed and is extending substantially the length of the sleeve thereby defining an annular chamber in the sleeve. The sleeve at its lower end engages a faceplate which engages the roof. The upper end of the sleeve can be secured in the bore with an anchor, as is well known in the art. Ports in the lower end of the sleeve permit the separate introduction of separate components of a hardenable binder material, which mix as they pass up through the annular chamber. The binder is extruded out through ports in the upper end of the sleeve and travels downward filling the annular space between the sleeve and the bore. The binder hardens securing the central member and the sleeve in the bore.Other References
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