CA1221114A - Weighing scale with preset means for concrete mixing plants - Google Patents
Weighing scale with preset means for concrete mixing plantsInfo
- Publication number
- CA1221114A CA1221114A CA000441924A CA441924A CA1221114A CA 1221114 A CA1221114 A CA 1221114A CA 000441924 A CA000441924 A CA 000441924A CA 441924 A CA441924 A CA 441924A CA 1221114 A CA1221114 A CA 1221114A
- Authority
- CA
- Canada
- Prior art keywords
- control unit
- value
- weighing scale
- concrete mixing
- mixing plants
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G1/00—Weighing apparatus involving the use of a counterweight or other counterbalancing mass
- G01G1/02—Pendulum-weight apparatus
- G01G1/04—Pendulum-weight apparatus the pendulum having a fixed pivot axis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
- G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
- G01G23/365—Indicating the weight by electrical means, e.g. using photoelectric cells involving comparison with a reference value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
- G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
- G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
- G01G23/3707—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting using a microprocessor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
- Control Of Non-Electrical Variables (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
A B S T R A C T
This invention concerns a weighing scale control unit (10) for concrete mixing plants which comprises in coordinated cooperation:
- a one-pendulum balance beam (14), a transducer (19) able to monitor the value of the displacement of the one-pendulum balance beam (14) and to convert that value into an electrical analogue signal, - an analogue-digital converter (24) to convert that signal, - and a numerical display (25), programming means (27-127) to pre-set the weight for each component to be weighed and a comparator (26) to compare the value monitored with the pre-set value being also included.
The invention also concerns a procedure for the reading of values of weight with a weighing scale control unit (10) for concrete mixing plants, the control unit (10) being constitut-ed according to the foregoing details, in which procedure an analogue signal coming from a transducer (19) is converted into a digital signal by a converter (24) and is then compared by a comparator (26) with a value pre-set on a programming means (27) in relation to the component being batched, the digital signal being shown on a numerical display (25).
This invention concerns a weighing scale control unit (10) for concrete mixing plants which comprises in coordinated cooperation:
- a one-pendulum balance beam (14), a transducer (19) able to monitor the value of the displacement of the one-pendulum balance beam (14) and to convert that value into an electrical analogue signal, - an analogue-digital converter (24) to convert that signal, - and a numerical display (25), programming means (27-127) to pre-set the weight for each component to be weighed and a comparator (26) to compare the value monitored with the pre-set value being also included.
The invention also concerns a procedure for the reading of values of weight with a weighing scale control unit (10) for concrete mixing plants, the control unit (10) being constitut-ed according to the foregoing details, in which procedure an analogue signal coming from a transducer (19) is converted into a digital signal by a converter (24) and is then compared by a comparator (26) with a value pre-set on a programming means (27) in relation to the component being batched, the digital signal being shown on a numerical display (25).
Description
1 Description of the invention entitled:
IV~7-~'f ,'7~65 j~/~"J5
IV~7-~'f ,'7~65 j~/~"J5
2 "WEIGHING SCALE~ k-**~ FOR CONCRETE MIXING PLANTS"
3 in the name of OFFICINE RIUNIrE UDINE SpA at Udine 6 This invention concerns a weighing scale control unit for 7 concrete mixing plants. To be more exact, the invention 8 concerns a weighing scale control unit of an improved type 9 able to obtain an outstanding accuracy of measurement.
The invention also concerns a procedure to read the weight 11 with the weighing scale control unit.
12 Weighing scales for concrete mixing plants are known the 13 control units of which have a two-pendulum balance beam. It is 14 a purpose of this invention to provide a control unit having a simplified construction and pre-setting system.
16 It is a further purpose of the invention to enable zeroing 17 and measurement to be performed quickly and accurately.
18 Yet another purpose of the invention is to provide 19 measurements not affected by sharp changes of temperature or variations in the electricity supply voltage.
21 It is also a purpose of the invention to enable the values 22 monitored to be read easily and at once.
23 According to the invention the foreyoing purposes are 24 attained ~y employing a control unit with a one-pendulum balance beam, which actuates a linear potentiometer or other - 2 _ ~ ~2 1 suitable transducer.
2 A mechanical transmission connects the main shaft of the 3 weighing scale to the one-pendulum balance beam~ which is
The invention also concerns a procedure to read the weight 11 with the weighing scale control unit.
12 Weighing scales for concrete mixing plants are known the 13 control units of which have a two-pendulum balance beam. It is 14 a purpose of this invention to provide a control unit having a simplified construction and pre-setting system.
16 It is a further purpose of the invention to enable zeroing 17 and measurement to be performed quickly and accurately.
18 Yet another purpose of the invention is to provide 19 measurements not affected by sharp changes of temperature or variations in the electricity supply voltage.
21 It is also a purpose of the invention to enable the values 22 monitored to be read easily and at once.
23 According to the invention the foreyoing purposes are 24 attained ~y employing a control unit with a one-pendulum balance beam, which actuates a linear potentiometer or other - 2 _ ~ ~2 1 suitable transducer.
2 A mechanical transmission connects the main shaft of the 3 weighing scale to the one-pendulum balance beam~ which is
4 pivotable about a horizontal axis.
Each movement of the main shaft caused by the application 6 of a force to the weighing scale produces a corresponding 7 rotation of the one-pendulum balance beam.
8 The angular rotation of the balance beam is converted into 9 movement of the pointer of a potentiometer.
The resulting variation in electrical resistance is 11 monitored by an electrical circuit, which may comprise an 12 analogue-digital converter.
13 To be more exact, the drop in voltage at the ends of the 14 potentiometer is important and is proportional to the rotation of the one-pendulum balance beam and therefore to the force 16 applied to the weighing scale.
17 Variations in resistance of the potentiometer due to sharp 18 changes in temperature, or in any event variations in the 19 voltage supplying the potentiometer, advantageously do not alter the accuracy of the whole device since the analogue-21 digital converter has the voltage supplying the potentiometer 22 as its reference point.
23 The electronic circuit downstream from the potentiometer 2~ comprises a comparator, which compares the measured value coming from the analogue-digital converter ~ith the value 26 pre-set on a programming means.
27 The control unit includes one programming means for each 28 component to be batched.
29 When the value pre-set on one of the programming means is reached, a relay actuated by the comparator stops the feeding 31 of the component in question (cement or aggregate). An 32 appropriate display shows the total weight continuously.
33 The invention is therefore embodied with a weighing scale - 3 - ~ Z ~
1 control unit for concrete mixing plants which comprises in 2 coordinated cooperation:
3 - a one-pendulum balance beam, 4 - a transducer able to monitor the value of the displacement of the one-pendulum balance beam and to convert that value 6 into an electrical analogue signal, 7 - an analogue-digital converter to convert that signal, and 8 - a numerical display, 9 programming means to pre-set the weight for each component to be weighed and a comparator to compare the value monitored 11 with the pre-set value being also included.
12 The invention is also obtained with a procedure to read 13 values of weight with a weighing scale control unit for 14 concrete mixing plants, according to which an analogue signal coming from the transducer is converted into a digital signal 16 by the converter and is then compared by the comparator with 17 the value pre-set on the programming means in relation to the 18 component being batched, the digital signal being shown on a 19 numerical display.
We shall describe hereinafter, as a non-restrictive 21 example, a preferred embodiment of the invention with the help 22 of the attached figures, in which:-23 Figs.1 give two views of the control unit of the invention;
24 Fig.2 shows a block diagram of the electronic circuit used.
In Figs.1a and 1b, a weighing scale control unit according 26 to the invention is referenced with 10.
27 The lower end, shaped hook-wise in our example, of a push-28 pull rod 11 is connected to the main shaft of the weighing 29 scale (not shown).
The force applied by the main shaft to the push-pull rod 11 31 is transmitted through a flexible metallic tape 12 to an 32 eccentric 13. The metallic tape 12 winds onto the eccentric 13 33 at least partly.
- 4 - ~ ~2~
1 The eccentric 13 is solidly fixed to a crown 114 of a one-2 pendulum balance beam 14, of which the bob 214 is fiY~ed 3 solidly to the crown 114 through a rigid pendulum shaft 314.
4 The eccentric 13 has the known function of correcting the balancing characteristics of the one-pendulum balance beam 14.
6 The one-pendulum balance beam 14 rotates about a horizontal .~ 7 axis 15 coaxial with the crown 114.
8 In its position of rest the one-pendulum balance beam 14 9 rests against a retaining cradle 16.
In the example shown a retaining device 17 is envisaged 11 which here is an eccentric 117 that presses against the bob 12 214 of the one-pendulum balance beam 14 in the retaining 13 position and hinders the movement of the latter.
14 A lever 217 enables the eccentric 117 to be rotated by hand.
16 A flexible pull wire 18 wound at least partly onto the 17 periphery of the crown 114 transmits the motion to a 18 transducer 19. In the example shown the transducer 19 consists 19 of a linear potentiometer 119 the pointer 219 of which is actuated by the pull wire 18.
21 This actuation can be active in both directions; in such a 22 case the pull wire 18 can be, for instance, a sheathed steel 23 cable, which is therefore able to-transmit compression forces 24 as well.
Otherwise, the actuation can be active by traction alone 26 (that is, when the balance beam rotates anticlockwise) and the Z7 opposite movement of the pointer 213 can be caused by return 28 spring means (not shown here).
29 Electrical connections 20 for the interpretation circuit depart from the potentiometer 119. The whole system is held in 31 a casing 21 connected to a carrying frame 22, from which two 32 lateral uprights 122 rise vertically to support the one-33 pendulum balance beam 14 and potentiometer 119. The frame 22
Each movement of the main shaft caused by the application 6 of a force to the weighing scale produces a corresponding 7 rotation of the one-pendulum balance beam.
8 The angular rotation of the balance beam is converted into 9 movement of the pointer of a potentiometer.
The resulting variation in electrical resistance is 11 monitored by an electrical circuit, which may comprise an 12 analogue-digital converter.
13 To be more exact, the drop in voltage at the ends of the 14 potentiometer is important and is proportional to the rotation of the one-pendulum balance beam and therefore to the force 16 applied to the weighing scale.
17 Variations in resistance of the potentiometer due to sharp 18 changes in temperature, or in any event variations in the 19 voltage supplying the potentiometer, advantageously do not alter the accuracy of the whole device since the analogue-21 digital converter has the voltage supplying the potentiometer 22 as its reference point.
23 The electronic circuit downstream from the potentiometer 2~ comprises a comparator, which compares the measured value coming from the analogue-digital converter ~ith the value 26 pre-set on a programming means.
27 The control unit includes one programming means for each 28 component to be batched.
29 When the value pre-set on one of the programming means is reached, a relay actuated by the comparator stops the feeding 31 of the component in question (cement or aggregate). An 32 appropriate display shows the total weight continuously.
33 The invention is therefore embodied with a weighing scale - 3 - ~ Z ~
1 control unit for concrete mixing plants which comprises in 2 coordinated cooperation:
3 - a one-pendulum balance beam, 4 - a transducer able to monitor the value of the displacement of the one-pendulum balance beam and to convert that value 6 into an electrical analogue signal, 7 - an analogue-digital converter to convert that signal, and 8 - a numerical display, 9 programming means to pre-set the weight for each component to be weighed and a comparator to compare the value monitored 11 with the pre-set value being also included.
12 The invention is also obtained with a procedure to read 13 values of weight with a weighing scale control unit for 14 concrete mixing plants, according to which an analogue signal coming from the transducer is converted into a digital signal 16 by the converter and is then compared by the comparator with 17 the value pre-set on the programming means in relation to the 18 component being batched, the digital signal being shown on a 19 numerical display.
We shall describe hereinafter, as a non-restrictive 21 example, a preferred embodiment of the invention with the help 22 of the attached figures, in which:-23 Figs.1 give two views of the control unit of the invention;
24 Fig.2 shows a block diagram of the electronic circuit used.
In Figs.1a and 1b, a weighing scale control unit according 26 to the invention is referenced with 10.
27 The lower end, shaped hook-wise in our example, of a push-28 pull rod 11 is connected to the main shaft of the weighing 29 scale (not shown).
The force applied by the main shaft to the push-pull rod 11 31 is transmitted through a flexible metallic tape 12 to an 32 eccentric 13. The metallic tape 12 winds onto the eccentric 13 33 at least partly.
- 4 - ~ ~2~
1 The eccentric 13 is solidly fixed to a crown 114 of a one-2 pendulum balance beam 14, of which the bob 214 is fiY~ed 3 solidly to the crown 114 through a rigid pendulum shaft 314.
4 The eccentric 13 has the known function of correcting the balancing characteristics of the one-pendulum balance beam 14.
6 The one-pendulum balance beam 14 rotates about a horizontal .~ 7 axis 15 coaxial with the crown 114.
8 In its position of rest the one-pendulum balance beam 14 9 rests against a retaining cradle 16.
In the example shown a retaining device 17 is envisaged 11 which here is an eccentric 117 that presses against the bob 12 214 of the one-pendulum balance beam 14 in the retaining 13 position and hinders the movement of the latter.
14 A lever 217 enables the eccentric 117 to be rotated by hand.
16 A flexible pull wire 18 wound at least partly onto the 17 periphery of the crown 114 transmits the motion to a 18 transducer 19. In the example shown the transducer 19 consists 19 of a linear potentiometer 119 the pointer 219 of which is actuated by the pull wire 18.
21 This actuation can be active in both directions; in such a 22 case the pull wire 18 can be, for instance, a sheathed steel 23 cable, which is therefore able to-transmit compression forces 24 as well.
Otherwise, the actuation can be active by traction alone 26 (that is, when the balance beam rotates anticlockwise) and the Z7 opposite movement of the pointer 213 can be caused by return 28 spring means (not shown here).
29 Electrical connections 20 for the interpretation circuit depart from the potentiometer 119. The whole system is held in 31 a casing 21 connected to a carrying frame 22, from which two 32 lateral uprights 122 rise vertically to support the one-33 pendulum balance beam 14 and potentiometer 119. The frame 22
- 5 ~
1 can be levelled by means of a spirit level 23.
2 Fig.2 shows a block diagram of the interpretation and 3 display circuit. An analogue signal coming from the transducer 4 19 is converted into a digital signal by an analogue-digital converter 24.
1 can be levelled by means of a spirit level 23.
2 Fig.2 shows a block diagram of the interpretation and 3 display circuit. An analogue signal coming from the transducer 4 19 is converted into a digital signal by an analogue-digital converter 24.
6 The digital signa~ is shown on a display 25, preferably of
7 a gas-discharge type, and is sent to a comparator 26 at the
8 same time. The comparator 26 performs a comparison of the
9 signal with a value pre~set on a programming means 27.
A programming means 127 shown with dashes in the figure is 11 intended to indicate that there is a plurality of programming 12 means 27, namely one for each component to be batched.
13 When the desired value pre-set on 27 is reached, the 14 comparator 26 actuates a relay 28, which stops the feed of the component then being batched.
16 We have indicated with 29 various supply means for the 17 components of the circuit.
18 We have described here, as an example, a preferred 19 embodiment of the invention, but variants are possible without departing from the scope of the informative idea of the 21 invention itself.
22 For instance, one variant may envisage the employment of a 23 transducer 19 not having linear characteristics, the purpose 24 being to compensate for the non-linearity of the balancing characteristics of the one-pendulum balance beam 14; in such 26 an event the eccentric 13 would not be required and would be 27 replaced with a cylindrical drum coaxial with the crown 114.
28 Thus, for instance 9 it is possible to embody the trans-29 mission of force frorn the main shaft to the one-pendulum balance beam 14 with levers or push-pull means of a type other 31 than that shown.
32 It is possible to replace the linear potentiometer 119 with 33 a non-linear one or else with an equivalent transducer device ~ - 6 - ~ 4 1 able to convert a mechanical value into a proportional 2 electrical value.
3 It is also possible to use a numerical display 25 other 4 than a gas-discharge display, such as an LED display or liquid crystal display, for instance, or a display with flap pads or 6 movable sectors, or of another equivalent type.
7 It is also possible to change the shapes and the lay-out of 8 the parts and to use retaining means of a type other than that 9 shown~
Further variants are possible for a person skilled in this 11 field without departing thereby from the scope of the 12 invention.
INDEX
2 10 - weighing scale control unit 3 11 - push~pull rod 4 12 - tape 13 - eccentric 6 14 - one-pendulum balance beam 7 114 - crown B 21 a, - bob 9 314 - pendulum shaft 15 - axis of rotation 11 16 - retaining cradle 12 17 - retaining device 13 117 - eccentric 14 217 - lever 18 - pull wire 16 19 - transducer 17 119 - potentiometer 18 219 - pointer 19 20 - electrical connections 21 - casing 21 22 - frame 22 122 - uprights 23 23 - spirit level 24 24 - analogue-digital converter 25 25 - display 26 26 - comparator 27 27 - programming means 28 127 - programming means 29 28 - relay 30 29 - supply means
A programming means 127 shown with dashes in the figure is 11 intended to indicate that there is a plurality of programming 12 means 27, namely one for each component to be batched.
13 When the desired value pre-set on 27 is reached, the 14 comparator 26 actuates a relay 28, which stops the feed of the component then being batched.
16 We have indicated with 29 various supply means for the 17 components of the circuit.
18 We have described here, as an example, a preferred 19 embodiment of the invention, but variants are possible without departing from the scope of the informative idea of the 21 invention itself.
22 For instance, one variant may envisage the employment of a 23 transducer 19 not having linear characteristics, the purpose 24 being to compensate for the non-linearity of the balancing characteristics of the one-pendulum balance beam 14; in such 26 an event the eccentric 13 would not be required and would be 27 replaced with a cylindrical drum coaxial with the crown 114.
28 Thus, for instance 9 it is possible to embody the trans-29 mission of force frorn the main shaft to the one-pendulum balance beam 14 with levers or push-pull means of a type other 31 than that shown.
32 It is possible to replace the linear potentiometer 119 with 33 a non-linear one or else with an equivalent transducer device ~ - 6 - ~ 4 1 able to convert a mechanical value into a proportional 2 electrical value.
3 It is also possible to use a numerical display 25 other 4 than a gas-discharge display, such as an LED display or liquid crystal display, for instance, or a display with flap pads or 6 movable sectors, or of another equivalent type.
7 It is also possible to change the shapes and the lay-out of 8 the parts and to use retaining means of a type other than that 9 shown~
Further variants are possible for a person skilled in this 11 field without departing thereby from the scope of the 12 invention.
INDEX
2 10 - weighing scale control unit 3 11 - push~pull rod 4 12 - tape 13 - eccentric 6 14 - one-pendulum balance beam 7 114 - crown B 21 a, - bob 9 314 - pendulum shaft 15 - axis of rotation 11 16 - retaining cradle 12 17 - retaining device 13 117 - eccentric 14 217 - lever 18 - pull wire 16 19 - transducer 17 119 - potentiometer 18 219 - pointer 19 20 - electrical connections 21 - casing 21 22 - frame 22 122 - uprights 23 23 - spirit level 24 24 - analogue-digital converter 25 25 - display 26 26 - comparator 27 27 - programming means 28 127 - programming means 29 28 - relay 30 29 - supply means
Claims (5)
1. Weighing scale control unit for concrete mixing plants which comprises in coordinated cooperation:
- a one-pendulum balance beam, a transducer able to monitor the value of the displacement of the one-pendu-lum balance beam and to convert that value into an electrical analogue signal, - an analogue-digital converter to convert that signal, - and a numerical display, programming means to pre-set the weight for each component to be weighed and a comparator to compare the value monitored with the pre-set value being also included.
- a one-pendulum balance beam, a transducer able to monitor the value of the displacement of the one-pendu-lum balance beam and to convert that value into an electrical analogue signal, - an analogue-digital converter to convert that signal, - and a numerical display, programming means to pre-set the weight for each component to be weighed and a comparator to compare the value monitored with the pre-set value being also included.
2. Weighing scale control unit for concrete mixing plants as claimed in claim 1, in which the transducer consists of a potentiometer the pointer of which takes its motion from the one-pendulum balance beam.
3. Weighing scale control unit for concrete mixing plants as claimed in claims 1 and 2, in which the potentiometer os of a linear type.
4. Weighing scale control unit for concrete mixing plants as claimed in claims 1 and 2, in which the potentiometer is of a non-linear type.
5. Procedure for the reading of values of weight with a weighing scale control unit for concrete mixing plants, the control unit being constituted according to claim 1 or claim 2, in which procedure an analogue signal coming from a transducer is converted into a digital signal by a converter and is then compared by a comparator with a value pre-set on a programming means in relation to the component being batched, the digital signal being shown on a numerical display.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT60534B/82 | 1982-12-23 | ||
| IT6053482U IT8260534V0 (en) | 1982-12-23 | 1982-12-23 | BALANCE HEAD FOR BATCHING CENTRAL UNITS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1221114A true CA1221114A (en) | 1987-04-28 |
Family
ID=11291469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000441924A Expired CA1221114A (en) | 1982-12-23 | 1983-11-25 | Weighing scale with preset means for concrete mixing plants |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1221114A (en) |
| ES (1) | ES528301A0 (en) |
| FR (1) | FR2538295A1 (en) |
| GB (1) | GB2132368A (en) |
| IT (1) | IT8260534V0 (en) |
| MX (1) | MX159947A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB714392A (en) * | 1951-09-05 | 1954-08-25 | Johannes Ewardus Nauta | Apparatus for weighing out in a vessel quantities of different substances |
| GB749092A (en) * | 1952-11-29 | 1956-05-16 | Schenck Gmbh Carl | Improvements in or relating to measuring instruments and balances |
| GB916020A (en) * | 1959-05-04 | 1963-01-16 | Howe Scale Company | Electrical signal transmitter |
| GB1193651A (en) * | 1966-05-25 | 1970-06-03 | Pedershaab Maskinfabrik As | Analog Computer for Proportioning the Components of a Batch Mixture. |
| FR2258253B1 (en) * | 1974-01-21 | 1978-03-17 | Lerebourg Michel |
-
1982
- 1982-12-23 IT IT6053482U patent/IT8260534V0/en unknown
-
1983
- 1983-11-25 CA CA000441924A patent/CA1221114A/en not_active Expired
- 1983-12-15 GB GB08333473A patent/GB2132368A/en not_active Withdrawn
- 1983-12-19 MX MX19983883A patent/MX159947A/en unknown
- 1983-12-20 FR FR8320348A patent/FR2538295A1/en active Granted
- 1983-12-22 ES ES528301A patent/ES528301A0/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB8333473D0 (en) | 1984-01-25 |
| FR2538295A1 (en) | 1984-06-29 |
| MX159947A (en) | 1989-09-19 |
| IT8260534V0 (en) | 1982-12-23 |
| ES8407580A1 (en) | 1984-10-01 |
| GB2132368A (en) | 1984-07-04 |
| ES528301A0 (en) | 1984-10-01 |
| FR2538295B3 (en) | 1985-04-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |