GB1570440A - Rotor for a concrete spray machine - Google Patents
Rotor for a concrete spray machine Download PDFInfo
- Publication number
- GB1570440A GB1570440A GB32222/77A GB3222277A GB1570440A GB 1570440 A GB1570440 A GB 1570440A GB 32222/77 A GB32222/77 A GB 32222/77A GB 3222277 A GB3222277 A GB 3222277A GB 1570440 A GB1570440 A GB 1570440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- chambers
- rotor body
- bodies
- plate
- 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
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/32—Conveying concrete, e.g. for distributing same at building sites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
- B65G53/4608—Turnable elements, e.g. rotary wheels with pockets or passages for material
- B65G53/4616—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning parallel to flow
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2035—Cylinder barrels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
- F04F1/06—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G2021/049—Devices for both conveying and distributing concrete mixing nozzles specially adapted for conveying devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Nozzles (AREA)
Abstract
The rotor (2) has chambers (5, 6) which are arranged concentrically about its axis (4), are open in the axial direction and are intended for receiving free-flowing concrete. The rotor body containing the chambers (5, 6) consists of an elastic material, for example of a single-part rubber body which is enclosed and supported on all sides by a metal cage (7, 8, 9), so that the chamber walls (6') yield as a result of superatmospheric pressure, when blowing out the concrete, in order to avoid adhesion of any remaining concrete. <IMAGE>
Description
(54) ROTOR FOR A CONCRETE SPRAY MACHINE
(71) We, MEYNADIER & CIE. AG., a
Swiss Body Corporate, of Vulkanstrasse 110, 8048 Zurich, Switzerland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a rotor for a concrete spray machine which comprises a rotor body defining a plurality of axially extending open ended chambers concentrically arranged about the rotor axis for receiving concrete.
Rotors of this type take flowable concrete which has been charged into their chambers by means of a funnel-shaped inlet hopper of the concrete spray machine.Upon rotation, the rotor conveys the concrete to a duct in which the concrete is ejected successively out of each chamber by means of compressed air into a spray nozzle. However, it is often found that the chambers- cannot be completely emptied because large gravel parts tend to form obstructive bridges which prevent complete expulsion of the concrete.
ore over, concrete builds up on, and remains adhered to, the chamber walls.
Such incomplete evacuation of the chambers results in poor performance of the machine.
According to the invention, there is provided a rotor for a concrete spray machine, the rotor having a body of resilient rubber material with chambers having deformable walls, which chambers are arranged concentrically around the axis of rotation of the rotor and are open at both ends in an axial direction for receiving flowable concrete, and rigid plate-like bodies at each end of the rotor body for securing the rubber material, the plate-like bodies being held apart by spacing means and being sealed to the rotor body.
With this construction, the rotor is not rigid, so that the chamber walls, upon blowing, yield when overpressures are applied to them and neutralize the tendency to form bridges. Furthermore, concrete stuck to the chamber walls is detached from them by the combined action of yielding and rotation of the chamber walls. Substantially complete evacuation of the chambers may thus be ensured, so that the entire volume of the chambers may be fully utilized, and the performance of the machine improved.
Since the rotor body is not rigid, when pressure is applied to a particular chamber, both this chamber and the adjacent chambers are deformed. The expansion of the chamber walls leads to the material adhering thereto becoming detached. The walls of the adjacent chambers are deformed inwards, and in particular in the previously emptied chamber, this inward deformation will ensure that any remaining material is detached. The chamber walls at the periphery of the rotor can also dilate. Parts of the chamber walls are therefore deformed in alternate directions as the rotor rotates. Since practically all the material is discharged from the chambers, a constant output efficiency can be achieved for the concrete spray machine. In addition, cleaning work and related pauses in the operation of the machine during spraying are not necessary.As a result of the self cleaning of the rotor, the rotor is not subject to the otherwise necessary repeated manual cleaning normally carried out with tools which may damage the rotor.
In a preferred embodiment, in order to increase the stability of the rotor body, the plate-like bodies are connected to one another non-rotatably by the spacing means.
The rotor may be formed in one piece and kept in position between the plate-like bodies by slightly compressing the rotor body, and a coupling element may be provided for the rotary drive of the rotor on the plate-like bodies and/or the spacing means.
This arrangement gives the rotor a stability with respect to the adjacent, fixed machine parts of the spray machine which is equal to that of a rotor made entirely of metal.
The spacing means may have a hub part which is formed so as to support the rotor and which has an engagement aperture for engaging a drive shaft for driving the rotor.
Using this preferable feature, no further spacing means are required.
The rotor may also be surrounded by a jacket connected to the plate-like bodies.
One plate-like body, the hub part and the jacket therefore form a cup-shaped cage surrounding the rotor body, which cage is closed by the other plate-like body. Using this feature, the resilient rubber rotor body is completely enclosed by nietal elements, which give the rotor the necessary stability and in particular protect the body from damage.
The dividing walls between two adjacent chambers in the rotor body preferably extend in substantially radial directions. The chambers may therefore be at least approximately trapezium-shaped, or in the shape of the sector of a circle, in cross-section. This means that the dividing walls are at least approximately of the same thickness at every point, in contrast to a rotor with chambers of circular cross-section, so that the deformation of the rotor body on blowing out of the chambers is better transmitted to the adjacent chambers. In order to affect the deformability of the dividing walls, these may be reinforced with plates.
In order to provide a seal in the radial direction between the rotor body and the plate-like bodies, the rotor body in accordance with a further improvement may have ribs on its front sides, the ribs being designed to engage with slots or grooves in the plate-like bodies.
An embodiment of the invention is described below with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic cross-sectional view of the concrete conveying part of a concrete spray machine with a rotor forming a first embodiment of the invention,
Figure 2 shows an axial cross-sectional view of a second embodiment of a rotor taking along the line B-B of Figure 3, and
Figure 3 is a cross-sectional view of the rotor of Figure 2 taken along the line A-A.
Figure 1 shows a concrete conveying part which comprises a funnel-shaped hopper 1, a rotor 2, and a blow-off union 3 to which it is possible to connect a hose, not shown, for spraying concrete. The rotor 2 defines a plurality of chambers which are open in axial direction and are concentrically arranged about the rotor axis 4, only the chambers 5 and 6 being shown in crosssection. The chambers 5, 6 are delimited by chamber walls 5', 6'. The rotor 2 is formed as a single-piece cylindrical body made of an elastic material, such as rubber, reinforced and surrounded by a metal jacket 7. The rotor 2 is covered at both its ends by friction discs 8 and 9 which are formed with openings adjacent to the chambers to establish a connection to the adjacent parts 10 and 11 of the machine and perform a sealing function in radial direction.A driving shaft, not shown, engages with a section 12 in order to drive the rotor 2. Above the chamber 6 there is an opening 13 through which compressed air can be blown into the chamber 6 in the direction of the arrow 14.
In the embodiment of Figure 1, the metallic friction discs 8 and 9 on the one hand form limiting elements for the rotor body containing the chambers 5, 6 and, on the other hand, form the connection to the adjacent, fixed machine parts 10 and 11 which has already been mentioned. The drive shaft (not shown) may engage in either one or both of the friction discs 8 and 9 through the opening 12.
The concrete spray machine operates as follows. Concrete flows in the direction of the arrow 15 from the hopper 1 into the chamber 5 of the driven rotor 2 and fills this chamber. After half a complete rotation of the rotor 2, the filled chamber reaches the position of the chamber 6 in which the duct 13, 6, 3 is under pressure. Compressed air flows through the opening 13 in the direction of the arrow 14, pushes the concrete present in the chamber in the direction of the arrow 16 out of the chamber 6 through the blow-off union 3 into a spray device, not shown. During the blowing action, an overpressure exists in the chamber 6, whereby the chamber walls 6' yield so as to prevent concrete from adhering to them or to the walls of an adjacent chamber, and thus ensuring substantially complete evacuation of the chamber. In the same way, each chamber is successively filled and after half a revolution of the rotor is discharged so that concrete is conveyed through the blow-off union 3 almost continuously. In order to prevent concrete obstructions in the union 3, compressed air is supplied in the direction of the arrow 17 through a back opening in the blow-off union 3, to assist displacement of the concrete through the union 3 towards the spray device, not shown.
Figures 2 and 3 illustrate in detail the construction of a second embodiment of a rotor 2. The construction comprises two friction discs 8 and 9, one at each front end of the rotor, the friction discs having openings 20 and 21 in the area swept by the chambers 6.
The metal cage completely surrounding the cylindrical single-piece rotor body 22 com prises a jacket 7 surrounding the rotor body 22, a base 23, and a cylindrical intermediate hub portion 24 as well as the upper friction disc 8 which covers and closes the cage. The lower friction disc 9 rests directly on the base 23. Both friction discs 8 and 9 are fixed to flange edges 25 and 26 of the jacket by means of bolts not shown. The base 23 and the friction disc 9 have openings 27 in the region swept by the chambers 9. In the centre of the intermediate portion 24 which serves as a hub portion there is formed a square hole 28 which is arranged to locate the drive shaft, not shown,
Metal plates 29 which serve as reinforcing elements are radially inserted in the rotor body 22 between each pair of adjacent chambers 26.The plates 29 are anchored in slots 30, 31 formed in the base 23 and in the upper friction disc 8.
The rotor body 22 comprises ribs 32, 33, 34 35 which are trapezium-shaped in cross-section, circular and concentrically arranged on both end sides, internally and externally with respect to the chamber 6, the ribs engaging with annular grooves in the base 23 and in the upper friction disc 8 which are equally trapezium-shaped in cross-section.
The illustrated construction can be slightly improved in so far as the elastic dilation of the chamber walls 6-' is concerned, if window-like openings are formed in the jacket 7 radially opposite to the chambers 6, the openings providing a by-pass to a limited extent in the rotor body 22. Such openings can also be provided in the intermediate hub portion 24. As an alternative, instead of the above-mentioned openings, the jacket 7 and/or the intermediate portion 24 can be bored.
The rotor body 22 is so dimensioned that after it has been mounted in the surrounding cage it is under tension.
The chambers 6 are preferably in the shape of a trapezium or a sector of a circle in cross-section. In this way the dividing walls between each two adjacent chambers extend in approximately radial planes. During blowing out, if one or several of the chambers 6 are pressurized, the dividing walls disposed between the chambers are inwardly curved to the adjacent unpressured chambers. This produces a deformation of the rotor body in an area around the pressurised chambers. This deformation may cause the rotor body to rise at points away from the jacket 7 so that the chamber walls 6' which radially confine the chambers 6 are deformed.The window-like openings in the jacket 7 and the hub part 24 which have already been mentioned therefore enable the chamber walls 6r to have an increased freedom of movement in the radial direction, which has almost the same effect as a radial spacing between the rotor body 22, the jacket 7 and the hub part 24.
WHAT WE CLAIM IS:
1. A rotor for a concrete spray machine.
the rotor having a body of resilient rubber material with chambers having deformable walls, which chambers are arranged concentrically around the axis of rotation of the rotor and are open at both ends in an axial direction for receiving flowable concrete, and rigid plate-like bodies at each end of the rotor body for securing the rubber material, the plate-like bodies being held apart by spacing means and being sealed to the rotor body.
2. A rotor as claimed in claim 1, characterised in that the plate-like bodies are connected non-rotatably to the spacing means, that the rotor body is formed in one piece and is maintained in compression between the plate-like bodies and that a coupling element disposed on the plate-like bodies and/or the spacing means is provided for connection to rotary drive means for the rotor.
3. A rotor as claimed in claim 2, characterised in that the spacing means comprise a hub which has an engagement opening for receiving a drive shaft of a rotary drive means.
4. A rotor as claimed in any preceding claim, wherein the plate-like bodies are metallic friction discs, and at least one of the discs is replaceable.
5. A rotor as claimed in any one of the previous claims, characterised in that the rotor body is surrounded by a jacket connected to the plate-like bodies.
6. A rotor as claimed in claim 5, characterised in that one of the plate-like bodies, the hub and the jacket form a cup-shaped cage surrounding the rotor body, which cage is closed by the second plate-like body.
7. A rotor as claimed in any preceding claim, characterised in that the rotor body has concentric annular ribs facing the platelike bodies, which ribs engage in grooves or slots in the plate-like bodies for sealing the chambers.
8. A rotor as claimed in any preceding claim, characterised in that the dividing walls disposed between each two adjacent chambers and consisting of the resilient rubber material of the rotor body are confined by surfaces extending in approximately radial directions.
9. A rotor as claimed in claim 8, characterised in that the chambers are formed in cross-section at least approximately as trapeziums or sectors of a circle.
10. A rotor as claimed in claim 8, characterised in that the dividing walls are reinforced by plates.
11. A rotor for a concrete spray machine substantially as herein described
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (12)
1. A rotor for a concrete spray machine.
the rotor having a body of resilient rubber material with chambers having deformable walls, which chambers are arranged concentrically around the axis of rotation of the rotor and are open at both ends in an axial direction for receiving flowable concrete, and rigid plate-like bodies at each end of the rotor body for securing the rubber material, the plate-like bodies being held apart by spacing means and being sealed to the rotor body.
2. A rotor as claimed in claim 1, characterised in that the plate-like bodies are connected non-rotatably to the spacing means, that the rotor body is formed in one piece and is maintained in compression between the plate-like bodies and that a coupling element disposed on the plate-like bodies and/or the spacing means is provided for connection to rotary drive means for the rotor.
3. A rotor as claimed in claim 2, characterised in that the spacing means comprise a hub which has an engagement opening for receiving a drive shaft of a rotary drive means.
4. A rotor as claimed in any preceding claim, wherein the plate-like bodies are metallic friction discs, and at least one of the discs is replaceable.
5. A rotor as claimed in any one of the previous claims, characterised in that the rotor body is surrounded by a jacket connected to the plate-like bodies.
6. A rotor as claimed in claim 5, characterised in that one of the plate-like bodies, the hub and the jacket form a cup-shaped cage surrounding the rotor body, which cage is closed by the second plate-like body.
7. A rotor as claimed in any preceding claim, characterised in that the rotor body has concentric annular ribs facing the platelike bodies, which ribs engage in grooves or slots in the plate-like bodies for sealing the chambers.
8. A rotor as claimed in any preceding claim, characterised in that the dividing walls disposed between each two adjacent chambers and consisting of the resilient rubber material of the rotor body are confined by surfaces extending in approximately radial directions.
9. A rotor as claimed in claim 8, characterised in that the chambers are formed in cross-section at least approximately as trapeziums or sectors of a circle.
10. A rotor as claimed in claim 8, characterised in that the dividing walls are reinforced by plates.
11. A rotor for a concrete spray machine substantially as herein described
with reference to and as shown in either
Figure 1 or Figures 2 and 3 of the accompanying drawings.
12. A concrete spray machine equipped with a rotor as claimed in any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH769979A CH608853A5 (en) | 1976-08-05 | 1976-08-05 | Rotor for a concrete-spraying machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1570440A true GB1570440A (en) | 1980-07-02 |
Family
ID=4357785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32222/77A Expired GB1570440A (en) | 1976-08-05 | 1977-08-01 | Rotor for a concrete spray machine |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5345025A (en) |
| AT (1) | AT354506B (en) |
| BR (1) | BR7705140A (en) |
| CH (1) | CH608853A5 (en) |
| DE (1) | DE2734311C2 (en) |
| FR (1) | FR2360726A1 (en) |
| GB (1) | GB1570440A (en) |
| ZA (1) | ZA774511B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031156A1 (en) * | 1990-09-08 | 1992-03-12 | Motan Verfahrenstechnik | Bucket wheel valve for dispensing loose material - has vertical shaft, with fixed radial blades, rotor, and annular casing |
| WO2007014676A1 (en) * | 2005-08-02 | 2007-02-08 | Linde Aktiengesellschaft | Engine |
| ITMI20130663A1 (en) * | 2013-04-23 | 2014-10-24 | Ocmer Company S R L | SPRAYING MACHINE AND PUMPING METHOD FOR CONSTRUCTION MATERIALS |
| CN110259132A (en) * | 2019-07-03 | 2019-09-20 | 吴鹏飞 | A kind of cement floor file device for building |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0149485B1 (en) * | 1984-01-17 | 1990-06-13 | Sandoz Ag | Method and apparatus for conveying powder or granular material |
| DE3825080A1 (en) * | 1988-07-23 | 1990-01-25 | Putzmeister Maschf | DEVICE AND METHOD FOR DISTRIBUTING PUMPABLE DICKERS IN MULTIPLE CONVEYING PIPES |
| CH678717A5 (en) * | 1989-04-08 | 1991-10-31 | Sandoz Ag | |
| FR2649436B1 (en) * | 1989-04-08 | 1991-11-08 | Sandoz Sa | CONCRETE SPRAYING MACHINE |
| DE4010521C2 (en) * | 1989-04-08 | 1999-07-15 | Mbt Holding Ag | Concrete spraying machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE485983C (en) * | 1926-08-18 | 1929-11-07 | Martinus Joaennes Stam | Compressed air delivery device for concrete, mortar and other viscous substances |
| US2299565A (en) * | 1942-02-02 | 1942-10-20 | Richard R Colburn | Pneumatic feeder |
| CH432360A (en) * | 1966-01-27 | 1967-03-15 | Aliva Ag | Machine for the pneumatic conveying of bulk materials, especially mortar or concrete |
| CH579697A5 (en) * | 1974-05-31 | 1976-09-15 | Spribag Ag |
-
1976
- 1976-08-05 CH CH769979A patent/CH608853A5/en not_active IP Right Cessation
-
1977
- 1977-07-26 ZA ZA00774511A patent/ZA774511B/en unknown
- 1977-07-29 DE DE2734311A patent/DE2734311C2/en not_active Expired
- 1977-08-01 GB GB32222/77A patent/GB1570440A/en not_active Expired
- 1977-08-03 FR FR7723906A patent/FR2360726A1/en active Granted
- 1977-08-04 BR BR7705140A patent/BR7705140A/en unknown
- 1977-08-05 AT AT577477A patent/AT354506B/en not_active IP Right Cessation
- 1977-08-05 JP JP9344577A patent/JPS5345025A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031156A1 (en) * | 1990-09-08 | 1992-03-12 | Motan Verfahrenstechnik | Bucket wheel valve for dispensing loose material - has vertical shaft, with fixed radial blades, rotor, and annular casing |
| WO2007014676A1 (en) * | 2005-08-02 | 2007-02-08 | Linde Aktiengesellschaft | Engine |
| ITMI20130663A1 (en) * | 2013-04-23 | 2014-10-24 | Ocmer Company S R L | SPRAYING MACHINE AND PUMPING METHOD FOR CONSTRUCTION MATERIALS |
| CN110259132A (en) * | 2019-07-03 | 2019-09-20 | 吴鹏飞 | A kind of cement floor file device for building |
Also Published As
| Publication number | Publication date |
|---|---|
| AT354506B (en) | 1979-01-10 |
| DE2734311A1 (en) | 1978-02-09 |
| FR2360726A1 (en) | 1978-03-03 |
| ATA577477A (en) | 1979-06-15 |
| JPS5745869B2 (en) | 1982-09-30 |
| FR2360726B1 (en) | 1983-05-27 |
| ZA774511B (en) | 1978-06-28 |
| JPS5345025A (en) | 1978-04-22 |
| CH608853A5 (en) | 1979-01-31 |
| BR7705140A (en) | 1978-04-25 |
| DE2734311C2 (en) | 1987-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930801 |