GB2028516A - Apparatus for converting a rotary viscometer for determining elastic properties of a viscoelastic substance - Google Patents
Apparatus for converting a rotary viscometer for determining elastic properties of a viscoelastic substance Download PDFInfo
- Publication number
- GB2028516A GB2028516A GB7928371A GB7928371A GB2028516A GB 2028516 A GB2028516 A GB 2028516A GB 7928371 A GB7928371 A GB 7928371A GB 7928371 A GB7928371 A GB 7928371A GB 2028516 A GB2028516 A GB 2028516A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shaft
- beaker
- axis
- viscometer
- drivable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Transmission Devices (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
In a rotary viscometer, the viscosity of a viscoelastic substance in a measuring beaker (20) is determined from the reaction torque acting on a bob (25), held lowered in the beaker, while the beaker is rotated at a constant speed by the frictional coupling between that beaker and a drivable shaft (15), in a recess (16) of which the beaker is mounted. By means of a drive converting mechanism (50) the viscometer can be adapted for determining the elastic properties of the viscoelastic substance by operatively connecting a connecting rod (70) of the drive converting mechanism to the measuring beaker (20), the mechanism (50) converting the continuous rotary drive of the shaft (15) into to-and-fro angular rotation of the beaker (20) within the recess (16). The required elasticity measurement can be derived from the difference in phase angle between the instantaneous angular position of the beaker and the instantaneous reaction torque acting on the bob (25). <IMAGE>
Description
SPECIFICATION
Apparatus for converting a rotary viscometer for determining elastic properties of a viscoelastic substance
This invention is concerned generally with a viscometer of the cup and bob type, that is to say a rotary viscometer of the kind comprising an upright drivable shaft, a measuring beaker arranged in a centrally disposed recess in said shaft such that it can adopt different angular positions within said recess about the shaft axis but being arranged there with frictional coupling so that rotary drive can be transmitted from said shaft to said beaker, and a bob which can be lowered into the beaker and held against rotation so that the viscosity of a substance in the beaker can be determined from the reaction torque acting on the bob.More particularly, the invention relates to apparatus for adapting such a viscometer for determining elastic properties of the viscoelastic substance. By "viscoelastic substance" is meant herein a substance which exhibits both viscous and elastic properties..
Accordingly, for use with a rotary viscometer of the kind referred to above, the invention provides apparatus for adapting the viscometer for determining elastic properties of a viscoelastic substance, comprising an eccentric body, having first and second cam disks, for mounting on said drivable shaft, an upright lay shaft positioned so as to be spaced away from said drivable shaft, first and second transfer elements mounted on said lay shaft, a connecting rod operatively connected between the first cam disk and the first transfer element so as to convert continuous rotation of said drivable shaft into to-and-fro angular rotation of said lay shaft, a measuring beaker for use in the viscometer, a guiding rod operatively connecting the second transfer element to the measuring beaker so as to transmit the to-and-fro angular rotation of the lay shaft to the beaker while overcoming the frictional coupling of the beaker with said drivable shaft, and a transducer, with a foilower head abutting against the second cam disk, so as to detect the instantaneous angular position of the beaker, the operative connection of the guiding rod to the beaker being releasable to enable, in use, continuous rotary drive to be transmitted frictionally from said drivable shaft to the beaker.
The invention also provides a rotary viscometer of the kind comprising an upright drivable shaft, a measuring beaker arranged in a centrally disposed recess in said shaft such that it can adopt different angular positions within said recess about the shaft axis but being arranged there with frictional coupling so that rotary drive can be transmitted from said shaft to said beaker, and a bob which can be lowered into the beaker and held against
rotation so that the viscosity of a substance in the beaker can be determined from the reaction torque acting on the bob, the viscometer incorporating apparatus for adapting the viscometer for determining elastic properties of a
viscoelastic substance, said apparatus comprising
an upright lay shaft spaced away from the drivable
shaft, an eccentric body having first and second cam disks, mounted on said drivable shaft, first and second transfter elements mounted on said lay shaft, a connecting rod operatively connected between the first cam disk and the first transfer element so as to convert continuous rotation of said drivable shaft into to-and-fro angular rotation of said lay shaft, a guiding rod operatively connecting the second transfer element to the measuring beaker so as to transmit the to-and-fro angular rotation of the lay shaft to the beaker while overcoming the frictional coupling of the beaker with said drivable shaft, and a transducer, with a follower head abutting against the second cam disk, so as to detect the instantaneous angular position of the beaker, the operative connection of the guiding rod to the beaker being releasable to enable, in use, continuous rotary drive to be transmitted frictionally from said drivable shaft to the beaker.
In one arrangement the connecting rod is arranged so as to extend radially inwardly towards the axis of the drivable shaft and have a follower element abutting against the first cam disk which is circular. Preferably, the follower surface of the follower element has a dimension in a direction extending perpendicularly to both the connecting rod and the axis of the drivable shaft which is at least twice as large as the distance between the axis of the drivable shaft and the axis of the first cam disk.
Suitably, the connecting rod is guided between two rollers and abuts tangentially against the first transfer element, the connecting rod being operatively connected to that element by means of a cable wound around the first transfer element.
Alternatively, the connecting rod may be operatively connected to the first transfer element by means of an inter-engaging tooth-system on the connecting rod and the first transfer element.
The distance from the axis of said drivable shaft to the point of connection of the guiding rod to the measuring beaker can be of equal magnitude to the distance from the axis of said lay shaft to the point of connection of the guiding rod to the second transfer element The measuring beaker can have a pre-formed cover plate with an opening therein, into which an insertion element on the guide rod, constructed as a ball-head joint, is releasably engaged.
The distance separating the axis of the drivable shaft from the axis of the lay shaft can be made equal to the distance separating the two connection points on the guiding rod.
For a better understanding of the present invention and to show the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which Figure 1 is a side-view, represented partly in section, of a rotary viscometer drive incorporating one form of apparatus in accordance with the invention with which a determination can be made of the elastic properties of a viscoelastic substance, and
Figure 2 is a top-view of the apparatus shown in Figure 1.
In Figure 1, 10 indicates a platform and 1 5 an upright drive shaft of a rotary viscometer (not shown in greater detail), in which the shaft 15 is driven around axis A in the direction of arrow P by means which are not shown. A measuring beaker 20 is received in a correspondingly shaped, centrally arranged recess 16 in the shaft 15, shown partly in section. The measuring beaker 20 is provided with a blind-hole bore 21, with a measuring gap, and a bob 25 is movable by means (which are not shown) in the direction of the arrow 1 so that it may be inserted in the bore 21 and then restrained there against rotation, the substance (fluid) under investigation being located in the blind-hole bore or put into it so as to fill the measuring gap.The beaker 20 is frictionally mounted in the recess 16 so that, when the viscometer is used for determining the viscosity of the substance under investigation, the beaker will co-rotate with the drive shaft 15, providing the static friction acting between the beaker 20 and shaft 1 5 is not exceeded by the shear resistance set up in the substance under investigation.
An eccentric body 30, constructed as a slip-on cap and represented in section, incorporates a first circular disk 31 and also a second circular disk 32 and is joined in a rotationally and torsionally secure manner to the first shaft 1 5 by means of screws 33. The eccentric body 30 is central, i.e.
arranged about the same axis A on the first shaft 1 5, while the two circular shaped disks 31, 32 have an axis A' arranged eccentrically relative to the axis A, so that they will function as cams.
A drive converting mechanism 50, which is mounted in a housing 40, is arranged at a distance from the drive shaft 15 on the platform 10, this mechanism being constructed for the purpose of converting a continuous rotational movement into a back-forward movement with a speed characteristic which varies sinusoidally with time.
The housing 40 is fixed to the platform 10 by means of a base plate 45 and screws 46.
The drive converting mechanism 50 consists essentially of the housing 40, the base plate 45, an upright lay shaft 55, arranged at a distance from, and viewed in the plane of the base plate 45 with displaced axis-centre B relative to, the first shaft 15, first and second transfer elements 56,
58, the second transfer element being connected
in a rotationally and torsionally secure manner to the second shaft 55, a push rod system consisting
essentially of a connecting rod 60 and a guiding
rod 70, and an inductive transducer 65 which is connected operatively to the second circular disk
32.
The second shaft 55, rotatable backwards and forwards around its axis B in the direction of
double-headed arrow P', is pivotally mounted at
one end in the base plate 45 and at the other end
in a cross-piece 76 arranged parallel to the base
plate 45 by means of stay bolts 75, 75'.
The first transfer element 56 is constructed in the example shown as a cylinder, against which the connecting rod 60 which moves backwards and forwards in direction of arrow 2 (axis of motion of the connecting rod 60) abuts tangentially. The axis of motion of the connecting rod 60 is arranged so as to be radially aligned with axis A of the first shaft 15 viewed in the plane of the base plate 45. In order to guarantee optimum transfer of movement from the connecting rod 60 onto the cylinder and consequently also onto the second shaft 55, a cable 59 is arranged to extend in a groove, not shown in greater detail, on the cylinder, the cable being wound essentially around the cylinder and being fixed to the connecting rod 60 with elements 63 in a way which is not shown in more detail.In a modification the connecting rod 60 and also the transfer element 56 -can be provided with an interengaging toothed system (not shown) for the exact transfer of movement. The connecting rod 60 is held constantly operatively abutting against the first circular disk or cam 31 by means of the force of a spring 62, which is connected at one end to the housing and at the other end to an arm 61 which is fixed to the connecting rod 60.
Furthermore, at the end facing the first circular disk or cam 31, the connecting rod 60 is provided with a follower element 64 abutting against the circular disk which viewed in the plane has a follower surface 64' extending essentially at rightangles to both axes A and A', this surface having a dimension in the direction extending perpendicularly to the axes A, A' and also to the connecting rod 60 which is at least twice as large as the distance separating the two axes A and A' from one other. Preferably, the connecting rod 60 lies on a guide support 51 and is guided between two cylinders of guide rollers 52, 52' arranged at a distance from one other for exact guiding of the connecting rod 60 such that its axis of motion extends radially inwardly towards the axis A. Each cylinder 52, 52' is pivoted respectively on an axis 53, 53' fixed essentially on the base plate 45.However, the cylinders can alternatively each be pivoted on a pin disposed on the guide support 51.
The guiding rod 70 is operatively connected at one end to the second transfer element 50 constructed as a disk, whereby the point of connection of the guiding rod on the disk is disposed eccentrically to axis B. At the other end the guiding rod 70 has an element 71, constructed for example as ball-head-joint and not shown in greater detail, which can be inserted in an opening 23 in the measuring beaker 20 eccentrically to axis A, or released from that opening. The opening 23 is provided in a cover plate 22 pre-formed on the flange 24 of the measuring beaker. The guide rod 70 transfers the backward-forward movement of the disk 58, which is connected operatively to the second shaft 55, to the measuring beaker 20, providing the element 71 is inserted in the opening 23.
The distance from the axis A to the point of
releasable connection of the element 71 in the
flange 24 of the measuring beaker is equal to the
distance from the axis B to the point of connection
of the guiding rod 70 to the transfer element 58,
and the diagonal distance from the axis A of the
first shaft 1 5 to the axis B of the second shaft 55
is equal to the distance between both points of
connection at the ends of the guiding rod 70 (Fig.
2).
The transducer 65 is fixed to the base plate 45
by means which are not shown and has a follower
head 66 (not shown in Fig. 2) in a tube 67, this
head being operatively held against the periphery
of the second circular disk or cam 32.
The method of operation of the apparatus for adapting the rotary viscometer for determining elastic properties of the viscoelastic substance under investigation is described as follows:- Proceeding from the first shaft 15, driven by means which are not shown, rotating continuously around its axis A in the direction of arrow P, the movement of the circular disks or cams 31,32 is transferred from the eccentric body 30 firstly to the connecting rod 60 and secondly to the follower head 66 of the transducer 65, as a result of which the connecting rod 60 and also the follower head 66 are moved backwards and forwards in the direction of arrow 2.On account of the operative connection of the connecting rod 60 to the first transfer element 56 arranged in a torsionally secure manner on the second shaft 55, the shaft 55 and consequently also the second transfer element 58 which is arranged by means of a spacer sleeve 57 at a distance from the first element 56, and also at the same time the connecting rod 70 fixed to this, are operated, so that the backward-forward movement is transferred synchronously onto the measuring beaker 20, providing the connecting lever 70 is engaged, by means of the element 71, with the beaker.The continuous rotational movement which, when the lever 70 is disengaged from the beaker is transferred frictionally from the first shaft 1 5 to the measuring beaker 20, is thus converted, with the rod 70 engaged, into a backward-forward movement overcoming the frictional forces acting between the beaker and the shaft, the backwardforward movement having a sine-shaped speed variation characteristic with time. The supplementary measurement for the known determination of its viscosity made possible by the use of the drive converting mechanism, takes pIece essentially through comparison of the phase of an electrical signal derived from the transducer 65, the phase of this signal being representative of the instantaneous angular position of the beaker from a given datum position, with the instantaneous value of the phase of the reaction torque acting on the bob 25.
Thus, with the apparatus described hereinabove, as incorporated in the rotary viscometer, it is possible to ascertain the elasticity of a substance under investigation having viscoelastic properties, in conjunction with the rotary viscosimeter, while the viscometer can of
course be used on its own for the true evaluation
of the viscosity of the substance under
investigation.
Claims (20)
1. For use with a rotary viscometer of the kind
comprising an upright drivable shaft, a measuring
beaker arranged in a centrally disposed recess in
said shaft such that it can adopt different angular
positions within said recess about the shaft axis
but being arranged there with frictional coupling
so that rotary drive can be transmitted from said
shaft to said beaker, and'a bob which can be
lowered into the beaker and held against rotation
so that the viscosity of a substance in the beaker
can be determined from the reaction torque acting
on the bob, apparatus for adapting the viscometer
for determining plastic properties of a viscoelastic
substance comprises an eccentric body, having
first and second cam disks, for mounting on said
drivable shaft, an upright lay shaft positioned so as
to be spaced away from said drivable shaft, first
and second transfer elements mounted on said lay
shaft, a connecting rod operatively connected
between the first cam disk and the first transfer
element so as to convert continuous rotation of
said drivable shaft into to-and-fro angular rotation
of said lay shaft, a measuring beaker for use in the
viscometer, a guiding rod operatively connecting
the second transfer element to the measuring
beaker so as to transmit the to-and-fro angular
rotation of the lay shaft to the beamer while overcoming the frictional coupling of the beaker
with said drivable shaft, and a transducer, with a
follower head abutting against the second cam
disk, so as to detect the instantaneous angular position of the beaker, the operative connection of
the guiding rod to the beaker being releasable to
enable, in use, continuous rotary drive to be
transmitted frictionally from said drivable shaft to
the beaker.
2. A rotary viscometer of the kind comprising
an upright drivable shaft, a measuring beaker
arranged in a centrally disposed recess in said
shaft such that it can adopt different angular
positions within said recess about the shaft axis
but being arranged there with frictional coupling
so that rotary drive can be transmitted from said
shaft to said beaker, and a bob which can be
lowered into the beaker and held against rotation
so that the viscosity of a substance in the beaker
can be determined from the reaction torque acting
on the bob, the viscometer incorporating
apparatus for adapting the viscometer for
determining elastic properties of a viscoelastic
substance, said apparatus comprising an upright
lay shaft spaced away from the drivable shaft, an
eccentric body, having first and second cam disks,
mounted on said drivable shaft, first and second
transfer elements mounted on said lay shaft, a
connecting rod operatively connected between
the first cam disk and the first transfer element so
as to convert continuous rotation of said drivable
shaft into to-and-fro angular rotation of said lay
shaft, a guiding rod operatively connecting the second transfer element to the measuring beaker so as to transmit the to-and-fro angular rotation of the lay shaft to the beaker while overcoming the frictional coupling of the beaker with said drivable shaft, and a transducer, with a follower head
abutting against the second cam disk, so as to detect the instantaneous angular position of the
beaker, the operative connection of the guiding
rod to the beaker being releasable to enable, in
use, continuous rotary drive to be transmitted frictionally from said drivable shaft to the beaker.
3. Apparatus according to claim 1 or a viscometer according to claim 2, wherein both
cam disks are circular.
4. Apparatus according to claim 1 or 3 or a viscometer according to claim 2 or 3, wherein the connecting rod is arranged so as to extend radially inwardly towards the axis of said drivable shaft
and has a follower element abutting against the first cam disk.
5. Apparatus or a viscometer according to claim 4, wherein the follower surface of the follower
element has a dimension in a direction extending perpendicularly to both the connecting rod and the axis of said drivable shaft which is at least twice as
large as the distance between the axis of said drivable shaft and the axis of the first cam disk.
6. Apparatus according to claim 1 or to any one of claims 3 to 5, or a viscometer according to any one of claims 2 to 5, wherein the connecting rod is
guided between two rollers and abuts tangentially
against the first transfer element, the connecting
rod being operatively connected to that element
by means of a cable wound around the first transfer element.
7. Apparatus according to claim 1, 3 or 4 or a viscometer according to any one of claims 2 to 4, wherein the connecting rod is operatively
connected to the first transfer element by means
of an interengaging tooth-system on the
connecting rod and the first transfer element.
8. Apparatus according to claim 1 or any one of
claims 3 to 7 or a viscometer according to any one
of claims 2 to 7, wherein the distance from the
axis of said drivable shaft to the point of
connection of the guiding rod to the measuring
beaker is of equal magnitude to the distance from
the axis of said lay shaft to the point of connection
of the guiding rod to the second transfer element.
9. Apparatus according to claim 1 or any one df claims 3 to 8 or a viscometer according to any one
of claim 2 to 8, wherein the measuring beaker has
a pre-formed cover plate with an opening therein,
into which an insertion element on the guide rod,
constructed as a ball-head joint, is releasably
engaged.
10. Apparatus according to claim 1 or any of
claims 3 to 9, or a viscometer according to any
one of claims 2 to 9, wherein the distance
separating the axis of the said drivable shaft from
the axis of the lay shaft is equal to the distance
separating the two connection points on the
guiding rod.
11. Apparatus for converting a rotary
viscometer for determining elastic properties of a viscoelastic substance, substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawing.
12. A viscometer substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
13. Supplementary device for a rotary viscometer with a pivoted measuring beaker arranged centrally in a recess of a first shaft and with at least one circular disk arranged eccentrically to the axis of the first shaft and also a lever system. the supplementary device having the foilowing features::
a) a second shaft (55) is provided which is axis parallel and viewed in the plane is displaced relative to the first shaft (15) and is pivoted around its perpendicular axis (B),
b) an eccentric body (30) with two circular disks (31, 32) is arranged on the first shaft (1 5) and two transfer elements (56, 58) are arranged on the second shaft (55),
c) the first transfer element (56) is operatively connected by means of a connecting rod (60) to the first circular disk (31) and the second transfer element (58) to the measuring beaker (20) by means of a detachable guiding lever (70), and
d) a transducer (65) with a scanning head (66) operatively connected to the second circular disk (32) is arranged at a distance from the first shaft (15).
14. Supplementary device according to claim 13, characterised in that the connecting rod (60) is arranged with its axis of motion radially in the same direction to the axis (A) of the first shaft (15) and has a scanning element (64) which is assigned to the first circular disk (31).
15. Supplementary device according to claims 1 3, 14, characterised in that the scanning element (64) is at least twice as large as the distance between the axis (A) of the first shaft (15) and the axis (A') of the circular disks (31, 32) amounts to (Fig. 2).
1 6. Supplementary device according to claim 13 characterised in that the connecting lever (60) is guided between two cylinders (52, 52') and abuts tangentially the first transfer element (56) and is operatively connected to the element by means of a cable (59) wound around the element.
1 7. Supplementary device according to claim 13, characterised in that the connecting lever (60) is operatively connected to the first transfer element (56) by means of a toothed system on both the connecting rod and the element.
18. Supplementary device according to claim 13 characterised in that the distance from the axis (A) of the first shaft (1 5) to the point of application of the guiding lever (70) on the measuring beaker (20) and also the distance from the axis (B) of the second shaft (55) to the point of application of the guiding lever (70) on the second transfer element (58) are of equal magnitude.
19. Supplementary device according to claim 13, characterised in that the measuring beaker (20) has a pre-formed cover plate (22) with an opening (23) into which the guide lever (70), which is provided with an element for insertion (71) constructed as ballhead joint, may be engaged.
20. Supplementary device according to claim 13, characterised in that the diagonal distance from {he axis (A) of the first shaft (.1 5) to the axis (B) of the second shaft (55) is equal to the distance of both points of application on the guiding lever (70).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH875178A CH634410A5 (en) | 1978-08-17 | 1978-08-17 | ADDITIONAL DEVICE TO A ROTATIONAL VISCOSIMETER. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2028516A true GB2028516A (en) | 1980-03-05 |
| GB2028516B GB2028516B (en) | 1982-12-15 |
Family
ID=4344299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7928371A Expired GB2028516B (en) | 1978-08-17 | 1979-08-15 | Apparatus for converting a rotary viscometer for determining elastic properties of a viscoelastic substance |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH634410A5 (en) |
| DE (1) | DE2929029A1 (en) |
| GB (1) | GB2028516B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2535052A1 (en) * | 1982-10-25 | 1984-04-27 | Agronomique Inst Nat Rech | METHOD AND APPARATUS FOR MEASURING THE RHEOLOGICAL PROPERTIES OF SEMI-SOLID BODIES BY HARMONIC SHEAR IN ROTATION |
| FR2561775A1 (en) * | 1984-03-20 | 1985-09-27 | Inst Neftechimicheskogo Sintez | VIBRORHEOMETER |
| EP1398615A1 (en) * | 2002-09-04 | 2004-03-17 | Trinity Biotech GmbH | Method and apparatus for determining the change in the flow behaviour of a fluid |
-
1978
- 1978-08-17 CH CH875178A patent/CH634410A5/en not_active IP Right Cessation
-
1979
- 1979-07-18 DE DE19792929029 patent/DE2929029A1/en not_active Withdrawn
- 1979-08-15 GB GB7928371A patent/GB2028516B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2535052A1 (en) * | 1982-10-25 | 1984-04-27 | Agronomique Inst Nat Rech | METHOD AND APPARATUS FOR MEASURING THE RHEOLOGICAL PROPERTIES OF SEMI-SOLID BODIES BY HARMONIC SHEAR IN ROTATION |
| EP0107593A1 (en) * | 1982-10-25 | 1984-05-02 | Institut National De La Recherche Agronomique (Inra) | Apparatus to measure rheological properties of a semi-solid body using harmonic shearing oscillations |
| US4535621A (en) * | 1982-10-25 | 1985-08-20 | Institut National De La Recherche Agronomique | Process and apparatus for measuring rheological properties of semi-solid bodies by harmonic shear in rotation |
| FR2561775A1 (en) * | 1984-03-20 | 1985-09-27 | Inst Neftechimicheskogo Sintez | VIBRORHEOMETER |
| EP1398615A1 (en) * | 2002-09-04 | 2004-03-17 | Trinity Biotech GmbH | Method and apparatus for determining the change in the flow behaviour of a fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2929029A1 (en) | 1980-02-28 |
| GB2028516B (en) | 1982-12-15 |
| CH634410A5 (en) | 1983-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |