Soft set overshot fishing tool
US5249625A · kind A · utility
5Cited by
3References
19Claims
0Family size
Inventors
Key dates
| Filing date | May 8, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid operated overshot with an outer metal mandrel internally supports a resilient internal sleeve. The sleeve telescopes over a fish to grip the fish on expanding radially inwardly. This expansion is fluid powered by applying a force to the inner sleeve to expand inwardly from a piston which compresses the sleeve, or form surrounding the inner sleeve in a concentric fluid receiving cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.