Viscometers
Abstract
Abstract VISCOMETERS FOR MEASURING THE VISCOSITY OF LIQUIDS INCLUDING VOLATILE LIQUIDS COMPRISE A PRESSURE INLET TUBE COMMUNICATING WITH A PLENUM AND A MEASURING BULB AND CAPILLARY ALSO COMMUNICATING WITH THE PLENUM. WHEN DETERMINING VISCOSITY, THE PRESSURE IS EQUALIZED BETWEEN THE BULB AND THE LOWER END OF THE CAPILLARY. A CONDUIT MAY BE PROVIDED TO CONTINIOUSLY DIVERT A PORTION OF A FLOWING LIQUID STREAM THROUGH THE BULB AND CAPILLARY TO CONTINUOUSLY PURGE THE VISCOMETER AND MONITOR THE STREAM. WHEN THE VISCOSITY IS TO BE MEASURED, THE DIVERTED STREAM IS INTERRUPTED AND THE PRESSURE EQUALIZED BOTH ABOVE THE BULB AND BELOW THE CAPILLARY AND THE VISCOSITY OF THE PURGING LIQUID REMAINING IN THE BULB IS DETERMINED. THE LIQUID LEVEL IN THE PLENUM MAY BE CONTROLLED WITHIN A PREDETERMINED RANGE SUCH THAT THE CAPILLARY COMMUNICATES WITH THE PLENUM ABOVE THE MAXIMUM LIQUID LEVEL AND THE LIQUID MAY BE DISCHARGED FROM THE PLENUM AND RETURNED TO THE FLOWING LIQUID STREAM.
Inventors
- 👤 Theodore Tovrog
- 👤 Arthur A Krawetz
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |