Yield point adaptation for rotating viscometers
US6874353B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2003 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Sep 10, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N11/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A conventional Couette viscometer is transformed to measure yield point, also known as yield stress, and other rheology of various fluids, including ones with particulates. A rotating viscometer includes a driven portion, a responsive body, a standard spring, and a plurality of fins. The fins have predetermined shapes such that the rotating viscometer and the standard spring, connected to the responsive body having at least a portion of the fins, are sensitive to detect yield stress of a test fluid composition in response to a selected rotation imparted to the driven portion. A method of measuring yield stress includes operating a standard rotating viscometer modified with a plurality of intermeshing fins such that a standard spring of the standard rotating viscometer responds to a torque that is related to yield stress and that is imposed by a stressed test material on a portion of the fins connected to the spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.