US3734119A
Expired / Lapsed
US
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Apparatus for determining viscosity
Assignee: NV Tools Ltd
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Filing: 1972-02-07
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Granted: 1973-05-22
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Expires: 1992-02-07
Abstract
Abstract Apparatus for determining the viscosity of a liquid which includes a pivoted paddle or like member arranged to be immersed in the liquid and driven by means of an electromagnetic force acting upon the member, means for reversing the direction of the electromagnetic force each time the member reaches a predetermined point in each direction of its travel and thereby causing the member to be driven back and forth in the liquid, and means for introducing a further liquid into the said liquid in such a way that in passing to the liquid said further liquid serves to lubricate the pivot of the member.
Inventors
- 👤 D Nudds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:21
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2506
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
Apparatus for determining the viscosity of a liquid, which includes a pivoted paddle or like member arranged to be immersed in the liquid and driven by means of an electromagnetic force acting upon the member, means for reversing the direction of the electromagnetic force each time the member reaches a predetermined point in each direction of its travel and thereby causing the member to be driven back and forth in the liquid, and means for introducing a further liquid into the said liquid in such a way that in passing to the liquid said further liquid serves to lubricate the pivot of the member.
Claim 2
Dependent Claim
104 words
Apparatus for determining the viscosity of a liquid, which includes a pivoted paddle or like member arranged to be immersed in the liquid and driven by means of an electromagnetic force acting upon the member, means for reversing the direction of the electromagnetic force each time the member reaches a predetermined point in each direction of its travel and thereby causing the member to be driven back and forth in the liquid, and means for introducing a further liquid into the said liquid in such a way that in passing to the liquid said further liquid serves to lubricate the pivot of the member.
Claim 3
Dependent Claim
56 words
Apparatus as claimed in claim 1, wherein the paddle or like member is arranged to be driven by means of a first magnet fixed to the paddle or like member at right angles to its longitudinal axis, which magnet co-operates with a coil, arranged to be energized with direct current, to provide the said electromagnetic force.
Claim 4
Dependent Claim
58 words
Apparatus as claimed in claim 2, wherein the said means for reversing the direction of the electromagnetic force includes transducers positioned adjacent the extreme positions of the paddle or like member and arranged to operate a control circuit to reverse the direction of current flow through the coil at each extreme position of the paddle or like member.
Claim 5
Dependent Claim
49 words
Apparatus as claimed in claim 3, wherein the transducers are arranged to be operated by means of a second magnet fixed to the paddle or like member at right angles to the longitudinal axis of the paddle or like member and also at right angles to the first magnet.
Claim 6
Dependent Claim
51 words
Apparatus as claimed in claim 1, wherein the paddle or like member is pivoted by means of a roller secured to the upper eNd of paddle or like member at right angles to the longitudinal axis thereof, which roller is mounted within a groove for pivotal movement about a horizontal axis.
Claim 7
Dependent Claim
13 words
Apparatus as claimed in claim 5, wherein the groove is of ''''dovetail'''' cross-section.
Claim 8
Dependent Claim
19 words
Apparatus as claimed in claim 5, wherein a conduit for said further liquid opens out into the said groove.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |