Viscometers
Abstract
Abstract A VISCOMETER HAS A CYLINDRICAL DRIVEN MEMBER IMMERSED IN THE LIQUID WITHIN A CYLINDRICAL CONTAINER. A CONTINUOSULY ROTATED DRIVE SHAFT EXTENDS INTO THE CONTAINER AND IS COUPLED BY A RESILIENT COUPLING TO THE DRIVEN MEMBER SO THAT THE VISCOUS DRAG DUE TO FLUID IN THE ANNULAR GAP BETWEEN THE DRIVEN MEMBER AND CONTAINER CAUSES THE DRIVEN MEMBER TO LAG BEHIND THE DRIVE SHAFT; THE LAG IS SENSED AS A TIME LAG, USING SENSORS OUTSIDE THE CONTAINER, AS A MEASURE OF VISCOSITY. WITH THIS CONSTRUCTION, THE VISCOUS TORQUE IS NOT TRANSMITTED THROUGH ANY SEALS OR BEARINGS. GUARD RINGS DIRECTLY DRIVEN BY THE DRIVE SHAFT MAY BE PROVIDED ADJACENT THE ENDS OF THE DRIVEN MEMBERS OT ELIMINATE END EFFECTS. A VERNIER MEASUREMENT SYSTEM WITH ELECTRICAL READ-OUT IS PROVIDED.
Inventors
- 👤 James Stewart Johnston
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |