EP0301000B1 - Screw press - Google Patents
Screw press Download PDFInfo
- Publication number
- EP0301000B1 EP0301000B1 EP87901711A EP87901711A EP0301000B1 EP 0301000 B1 EP0301000 B1 EP 0301000B1 EP 87901711 A EP87901711 A EP 87901711A EP 87901711 A EP87901711 A EP 87901711A EP 0301000 B1 EP0301000 B1 EP 0301000B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- pressure cone
- zone
- thread
- compressed
- 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
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000001913 cellulose Substances 0.000 claims abstract description 6
- 229920002678 cellulose Polymers 0.000 claims abstract description 6
- 239000002657 fibrous material Substances 0.000 claims abstract description 6
- 244000025254 Cannabis sativa Species 0.000 claims abstract description 3
- 238000003306 harvesting Methods 0.000 claims abstract description 3
- 239000010893 paper waste Substances 0.000 claims abstract description 3
- 239000003415 peat Substances 0.000 claims abstract description 3
- 239000000047 product Substances 0.000 claims abstract description 3
- 239000010902 straw Substances 0.000 claims abstract description 3
- 239000002023 wood Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036461 convulsion Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/121—Screw constructions
Definitions
- the present invention relates to an apparatus for compressing and dewatering moist cellulose-containing and/or other fibrous materials in pieces, e.g. waste paper, wood, grass, straw and other harvest products, cellulose, peat, bark and the like, which apparatus includes an input portion for the material, which is to be compressed and dewatered, a dewatering portion, and a discharge opening for the compressed and dewatered product, a rotary screw, and driving means, which make the scew rotate, said screw being eccentrically disposed in relation to the rotation axis of the screw and in relation to the mean screw line of the core, respectively.
- Screw presses are also known in a plurality of designs for dewatering fiber materials and other compressible materials in the form of pieces. Embodiments of such screw presses are shown in US-A-2 615 385 and in US-A-4 121 967. By means of these and other known screw presses materials having a very high moisture content can be dewatered but not to such an extent as is required when producing fuel briquettes.
- the object of the present invention is to design an apparatus of that kind, which is stated in the preamble and by means of which it is possible to dewater and to produce briquettes from the above-mentioned materials having moisture contents of as high as 60%, when hard, quite continuous briquettes having very high dry contents are produced.
- eccentricities of the screw shaft or of the thread were the main cause of the desired result.
- a cooperation between the eccentricities in the screw core and in the thread is achieved and thus, the core as well as the thread ought to be made eccentric in this area.
- the eccentricity of the thread is preferably attained by making it waved.
- the apparatus is, according to a preferred embodiment, designed in such a manner that the compressed body in or adjacent to the area of the drainage openings is cracked, so that the water from the central portion of the compressed body can be evacuated through the cracks outwards towards the jacket and then through the drainage openings in it.
- the srew press shown in Figure 1 is mounted on a base 1.
- the screw is mounted on base 1 by means of its feed portion 2, which is provided with an input portion 3.
- a feed hopper 4 is arranged above the input portion.
- a down-feeder 5 is disposed, which oscillates in a vertical direction and is driven via a crank 6 and transmission means 7 by driving shaft 8 of an electric motor 9.
- Driving shaft 8 is extended through a shaft housing 10 and is designed to drive a screw 11.
- Screw 11 extends through input portion 3, also through a dewatering cylinder 12 and finally into a first pressure cone 13.
- a second pressure cone, which constitutes a direct extension of first pressure cone 13, has a reference numeral 14 and a terminating nozzle having a third conical constrution 16 has reference numeral 15.
- Dewatering cylinder 12 and the preliminary portion of the connecting first pressure cone 13, Figure 4 are on their interior sides in a way known per se provided with longitudinal bars 17, which prevent the compressed material from rotating in the thread turn together with screw 11.
- the reference numeral of this zone is 18 - the jacket of dewatering cylinder 12 is provided with a plurality of drainage holes 19, which are distributed around the jacket. They have a diameter of 3 mm. Drainage zone 18 is surrounded by a casing 20, which collects water, which flows or is forced out through holes 19. A drainage duct from casing 20 has reference numeral 21.
- First pressure cone 13 is in its central portion surrounded by a cooling jacket 22, through which cooling water flows.
- the thread or wings 28 of screw 11 are not extended into second pressure cone 14, which by means of threads 23 is tightened to first pressure cone 13, but in return an extension of core 27 of the screw is extended with an extension piece 45 into said second pressure cone 14.
- This second pressure cone 14 is surrounded by a cooling jacket 24, through which cooling water flows in order to carry off heat, which is generated also in this second pressure cone.
- the terminating nozzle 16, the terminating inner diameter 25 of which is chosen in accordance with the desired diameter of the briquettes, is also mounted on the preceding pressure cone by means of screwing.
- Core 27 of screw 11 has a decreasing diameter along its length and partly also a varying shape.
- Thread 28 has a varying pitch along the length of the screw.
- thread 28 has a cylindric exterior contour, which in the area of first pressure cone 13 is transformed into a conical shape.
- Screw 11 can as far as the varying pitch of thread 28 is concerned be divided into a plurality of zones I-VI.
- first thread turn 28A zone I
- zone II the thread pitch is somewhat smaller and during these three thread turns 28B a certain compressing of the material takes place.
- zone III in dewatering cylinder 12
- the very large thread pitch leads to a tearing apart of the compressed material anew, which results in a multitude of cracks in the material with a predominantly radial direction.
- the material is compacted again in the following three thread turns 28D in zone IV in dewatering cylinder 12.
- screw 11 has a conical shape.
- the terminating thread turn in zone IV extends into pressure cone 13 with a moderate pitch.
- the following three thread turns 28E have a very small waved pitch.
- This feature as well as the conically decreasing shape of the thread turn lead to a very forceful additional compressing of the compressed material, while a very high pressure and heat is generated.
- the waved or winding shape of the thread results in a compressing of the compressed material by jerks, which has proved to be particularily effective, when trying to achieve a maximal compressing, and at the same time seems to facilitate the water removal. The latter effect seems to occur in the clearance or unloading phases, which follow every crest of a wave on the thread.
- Core 27 of the screw is shaped in the thread path between the thread turns in such a way, that the thread path bottom in axial sections is bowl-shaped, which is known per se.
- the mean diameter of screw core 27 is in the first three zones I-III and also in about half the fourth zone IV unalterably the same.
- the shape of screw core 27 in the remaining part is quite complicated.
- the diameter of thread path in this part is smaller than in the preceding thread turn.
- the diameter decreases further but to different degrees on different sides of the rotation axis, as is shown in Figures 2 and 3. While the diameter of the core decreases symmetrically, conically in an axial section, Figure 2, it decreases unsymmetrically in a section, which is transverse to the preceding one, Figure 3.
- the smallest radius R1 in thread path bottom 40 is considerably smaller than the smallest radius R2 in thread path bottom 41 on the opposite side of the screw.
- radius R3 is less than R4.
- radius R1 is smaller than the largest radius R5 in thread path bottom 42.
- the terminating pin 45 is eccentrically disposed but is parallell with the screw axis, which means that its point 46 while it is rotating describes a small circle, which prevents the packing of the canal, which screw core 27 has formed in the middle of the compressed body.
- the finished briquette material, which is pressed out through the terminating nozzle 15, is tube-shaped, so that steam also can leave pressure cone 13 in this central channel, in which a passage is kept open all the time by means of eccentric rotary pin 45.
- Driving means used to turn the nozzle has symbolically been indicated with numeral 51.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Materials For Medical Uses (AREA)
- Press Drives And Press Lines (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
Description
- The present invention relates to an apparatus for compressing and dewatering moist cellulose-containing and/or other fibrous materials in pieces, e.g. waste paper, wood, grass, straw and other harvest products, cellulose, peat, bark and the like, which apparatus includes an input portion for the material, which is to be compressed and dewatered, a dewatering portion, and a discharge opening for the compressed and dewatered product, a rotary screw, and driving means, which make the scew rotate, said screw being eccentrically disposed in relation to the rotation axis of the screw and in relation to the mean screw line of the core, respectively.
- Presses for briquette production from fibrous materials use cylinders and pistons as compressive devices. By means of available constructions, based on this principle, it is feasible to produce briquettes from materials having moisture precentages of less than 20%. Screw presses are also known in a plurality of designs for dewatering fiber materials and other compressible materials in the form of pieces. Embodiments of such screw presses are shown in US-A-2 615 385 and in US-A-4 121 967. By means of these and other known screw presses materials having a very high moisture content can be dewatered but not to such an extent as is required when producing fuel briquettes. A fundamental problem, which cannot be solved according to known technique, is how to be able to drain off the water from the pressure zone at the very high pressures, which are needed in order to attain a high water removal without simultaneously forcing out the compressed material together with the water. It is customary to provide the pressure cone with dewatering openings, e.g. in those constructions, which are shown in the above-mentioned patent specifications, but they render impossible the high pressure required to remove the water up to very high dry contents in the compressed material. In case the pressure in the pressure cone is elevated to very high levels, the compressed material will simply be "sprayed" out through the openings.
- In case on the other side these drainage openings are eliminated in order to create conditions for very high pressures in the pressure cone, the water will be locked up in the same. This set of problems seems to be the primary reason why screw presses so far could not be used to dewater moist, fibrous materials to very high dry contents while producing continuous compressed bodies.
- The object of the present invention is to design an apparatus of that kind, which is stated in the preamble and by means of which it is possible to dewater and to produce briquettes from the above-mentioned materials having moisture contents of as high as 60%, when hard, quite continuous briquettes having very high dry contents are produced. These and other objects can be attained therein that at least one first pressure cone is provided for a forceful compression of the material, that the wall of said pressure cone is impermeable at least in a zone thereof, that a jacket portion having drainage holes is disposed upstream of said first pressure cone, and that said screw extends from said input portion, through said jacket portion having drainage holes, into said zone of the pressure cone having an impermeable wall. I have found that if a screw press is designed in this way, it can very efficiently be dewatered, also in case the moisture content of the starting material is very high. The present invention is not based on any particular theory, which claims that it can explain scientifically why this effect is achieved. However, experiments, which have been carried out, indicate that the screw during its rotary movement kneads the material by subjecting it repeatedly to large local pressure increases and pressure drops, which seem to lead to voids being formed in the compressed material in the thread turn, in which voids water in the liquid and/or the gaseous phase can be accumulated under pressure in order to be evacuated backwards in the thread turn, during the rotary movement of the screw and while it is influenced by the pressure of the compressed material. When testing various designs of the screw it could not be fully determined whether eccentricities of the screw shaft or of the thread were the main cause of the desired result. Probably a cooperation between the eccentricities in the screw core and in the thread is achieved and thus, the core as well as the thread ought to be made eccentric in this area. The eccentricity of the thread is preferably attained by making it waved.
- The apparatus is, according to a preferred embodiment, designed in such a manner that the compressed body in or adjacent to the area of the drainage openings is cracked, so that the water from the central portion of the compressed body can be evacuated through the cracks outwards towards the jacket and then through the drainage openings in it.
- Further characterizing features, aspects and advantages of the present invention are stated in the appending patent claims and in the following description of a preferred embodiment.
- In the following description of a preferred embodiment reference will be made to the accompanying drawings, in which:
- Fig. 1 is a longitudinal section of the apparatus;
- Fig. 2 is a lateral view of a screw forming part of the apparatus;
- Fig. 3 shows the screw in a view III-III in Figure 2; and
- Fig. 4 is a longitudinal section of a dewatering cylinder and an attached first pressure cone.
- The srew press shown in Figure 1 is mounted on a base 1. The screw is mounted on base 1 by means of its feed portion 2, which is provided with an
input portion 3. A feed hopper 4 is arranged above the input portion. In hopper 4 a down-feeder 5 is disposed, which oscillates in a vertical direction and is driven via a crank 6 and transmission means 7 by drivingshaft 8 of anelectric motor 9. -
Driving shaft 8 is extended through ashaft housing 10 and is designed to drive ascrew 11. -
Screw 11 extends throughinput portion 3, also through a dewateringcylinder 12 and finally into afirst pressure cone 13. A second pressure cone, which constitutes a direct extension offirst pressure cone 13, has areference numeral 14 and a terminating nozzle having a third conical constrution 16 has reference numeral 15. - Dewatering
cylinder 12 and the preliminary portion of the connectingfirst pressure cone 13, Figure 4, are on their interior sides in a way known per se provided withlongitudinal bars 17, which prevent the compressed material from rotating in the thread turn together withscrew 11. In its rear portion - the reference numeral of this zone is 18 - the jacket of dewateringcylinder 12 is provided with a plurality ofdrainage holes 19, which are distributed around the jacket. They have a diameter of 3 mm.Drainage zone 18 is surrounded by acasing 20, which collects water, which flows or is forced out throughholes 19. A drainage duct fromcasing 20 hasreference numeral 21.First pressure cone 13 is in its central portion surrounded by acooling jacket 22, through which cooling water flows. - The thread or wings 28 of
screw 11 are not extended intosecond pressure cone 14, which by means of threads 23 is tightened tofirst pressure cone 13, but in return an extension ofcore 27 of the screw is extended with anextension piece 45 into saidsecond pressure cone 14. Thissecond pressure cone 14 is surrounded by acooling jacket 24, through which cooling water flows in order to carry off heat, which is generated also in this second pressure cone. The terminating nozzle 16, the terminating inner diameter 25 of which is chosen in accordance with the desired diameter of the briquettes, is also mounted on the preceding pressure cone by means of screwing. -
Core 27 ofscrew 11 has a decreasing diameter along its length and partly also a varying shape. Thread 28 has a varying pitch along the length of the screw. Along its main portion thread 28 has a cylindric exterior contour, which in the area offirst pressure cone 13 is transformed into a conical shape.Screw 11 can as far as the varying pitch of thread 28 is concerned be divided into a plurality of zones I-VI. - Zone I - a large pitch
- - one thread turn 28A
- Zone II - a moderate pitch
- - three thread turns 28B
- Zone III - a very large pitch
- - one thread turn 28C
- Zone IV - a moderate pitch
- - three thread turns 28D
- Zone V - a small waved pitch
- - three thread turns 28E
- The large pitch in first thread turn 28A, zone I, makes it easier for screw 28 to receive coarse materials, e.g. large paper lumps, boards and the like. In the next zone II in
input portion 3 the thread pitch is somewhat smaller and during these three thread turns 28B a certain compressing of the material takes place. In the preliminary thread turn 28C, zone III, in dewateringcylinder 12, the very large thread pitch leads to a tearing apart of the compressed material anew, which results in a multitude of cracks in the material with a predominantly radial direction. Subsequently, the material is compacted again in the following three thread turns 28D in zone IV in dewateringcylinder 12. In terminating zone V inpressure cone 13screw 11 has a conical shape. The terminating thread turn in zone IV extends intopressure cone 13 with a moderate pitch. The following three thread turns 28E have a very small waved pitch. This feature as well as the conically decreasing shape of the thread turn lead to a very forceful additional compressing of the compressed material, while a very high pressure and heat is generated. The waved or winding shape of the thread results in a compressing of the compressed material by jerks, which has proved to be particularily effective, when trying to achieve a maximal compressing, and at the same time seems to facilitate the water removal. The latter effect seems to occur in the clearance or unloading phases, which follow every crest of a wave on the thread. -
Core 27 of the screw is shaped in the thread path between the thread turns in such a way, that the thread path bottom in axial sections is bowl-shaped, which is known per se. The mean diameter ofscrew core 27 is in the first three zones I-III and also in about half the fourth zone IV unalterably the same. However, the shape ofscrew core 27 in the remaining part is quite complicated. Thus, the diameter of thread path in this part is smaller than in the preceding thread turn. Susbsequently the diameter decreases further but to different degrees on different sides of the rotation axis, as is shown in Figures 2 and 3. While the diameter of the core decreases symmetrically, conically in an axial section, Figure 2, it decreases unsymmetrically in a section, which is transverse to the preceding one, Figure 3. Thus, the smallest radius R₁ in thread path bottom 40 is considerably smaller than the smallest radius R₂ in thread path bottom 41 on the opposite side of the screw. The same relation exists in the next thread turn, in which radius R₃ is less than R₄. An additional particular feature is that radius R₁ is smaller than the largest radius R₅ in thread path bottom 42. Thus, thread 28 as well ascore 27 are designed in such a manner, that the compressed material is subjected to forceful local pressure increases, followed by pressure drops inpressure cone 13, which is impermeable. This certainly implies that the compressed material is throughly kneaded inpressure cone 13, so that voids are formed, in which water and vapor can be accumulated under a high pressure and at a high temperature. These voids are forced backwards. Why this happens is difficult to explain and it can only be observed as a fact. Thus, water and vapor, which are accumulated in these voids, is gradually transported backwards, which takes place by jerks. Also, since only a limited amount of vapor is compressed under a high pressure in each void, the risks, which otherwise are connected with a high vapor pressure, are eliminated. - The terminating
pin 45 is eccentrically disposed but is parallell with the screw axis, which means that itspoint 46 while it is rotating describes a small circle, which prevents the packing of the canal, which screwcore 27 has formed in the middle of the compressed body. Thus, the finished briquette material, which is pressed out through the terminating nozzle 15, is tube-shaped, so that steam also can leavepressure cone 13 in this central channel, in which a passage is kept open all the time by means of eccentricrotary pin 45. - The waved or winding shape of the thread in terminating
zone 5 is shown in Figure 2. Thus, threads in this zone are, in the two preliminary thread turns, provided with two forwardly directedportions tangents 50 of these crests and an imaginary tangent against the normal shape of the thread. This angle has a reference designation A in Figure 2. - In order to facilitate the clearance in the terminating nozzle, the same can be made rotary. Driving means used to turn the nozzle has symbolically been indicated with numeral 51.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87901711T ATE68515T1 (en) | 1986-03-12 | 1987-02-16 | SCREW PRESS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8601152A SE452331B (en) | 1986-03-12 | 1986-03-12 | SCREW PRESSURE FOR COMPRESSION AND DRAINAGE OF MORE OR LESS MOISTURE CELLULOSIC AND / OR OTHER FIBROSE MATERIALS IN PIECE FORM |
SE8601152 | 1986-03-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0301000A1 EP0301000A1 (en) | 1989-02-01 |
EP0301000B1 true EP0301000B1 (en) | 1991-10-16 |
Family
ID=20363803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87901711A Expired EP0301000B1 (en) | 1986-03-12 | 1987-02-16 | Screw press |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0301000B1 (en) |
AT (1) | ATE68515T1 (en) |
AU (1) | AU7128187A (en) |
DE (1) | DE3773927D1 (en) |
DK (1) | DK167934B1 (en) |
FI (1) | FI92478C (en) |
NO (1) | NO168430C (en) |
SE (1) | SE452331B (en) |
WO (1) | WO1987005619A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5452492A (en) * | 1992-09-26 | 1995-09-26 | Hamilton; Robin | Material collection |
US5611268A (en) * | 1992-09-26 | 1997-03-18 | Hamilton; Robin | Compactor with expanding and contracting nozzle |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4871449A (en) * | 1988-06-27 | 1989-10-03 | Lott W Gerald | Clarifier and screw compactor liquid-solid separator |
CN100411865C (en) * | 2006-04-12 | 2008-08-20 | 江国庆 | Carbon rod shaping machine |
GB2448925A (en) * | 2007-05-04 | 2008-11-05 | Taylor Products Ltd | Compactor |
PL218588B1 (en) * | 2009-06-18 | 2015-01-30 | Adam Piotr Junczyk | Method of manufacturing briquettes from size-reduced straw and the equipment for manufacturing briquettes |
CN102357515B (en) * | 2011-10-26 | 2014-03-19 | 邢征 | Kitchen waste crushing and squeezing processor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1087935A (en) * | 1953-08-13 | 1955-03-01 | Larbodiere Ets | Apparatus for liquefying solidified gasoline |
FR2555100B1 (en) * | 1983-11-21 | 1986-05-23 | Cohen Raymond | EXTRUSION SCREW AND THE MACHINES PROVIDED WITH THIS SCREW |
-
1986
- 1986-03-12 SE SE8601152A patent/SE452331B/en not_active IP Right Cessation
-
1987
- 1987-02-16 DE DE8787901711T patent/DE3773927D1/en not_active Expired - Fee Related
- 1987-02-16 AU AU71281/87A patent/AU7128187A/en not_active Abandoned
- 1987-02-16 EP EP87901711A patent/EP0301000B1/en not_active Expired
- 1987-02-16 WO PCT/SE1987/000075 patent/WO1987005619A1/en active IP Right Grant
- 1987-02-16 AT AT87901711T patent/ATE68515T1/en not_active IP Right Cessation
- 1987-11-03 NO NO874588A patent/NO168430C/en unknown
- 1987-11-12 DK DK592187A patent/DK167934B1/en not_active IP Right Cessation
-
1988
- 1988-09-12 FI FI884188A patent/FI92478C/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5452492A (en) * | 1992-09-26 | 1995-09-26 | Hamilton; Robin | Material collection |
US5611268A (en) * | 1992-09-26 | 1997-03-18 | Hamilton; Robin | Compactor with expanding and contracting nozzle |
US5768744A (en) * | 1992-09-26 | 1998-06-23 | Hamilton; Robin | Self-propelled waste collection vehicle |
Also Published As
Publication number | Publication date |
---|---|
NO168430B (en) | 1991-11-11 |
DK592187A (en) | 1987-11-12 |
SE8601152D0 (en) | 1986-03-12 |
SE8601152L (en) | 1987-09-13 |
FI884188A (en) | 1988-09-12 |
EP0301000A1 (en) | 1989-02-01 |
FI92478B (en) | 1994-08-15 |
FI884188A0 (en) | 1988-09-12 |
DE3773927D1 (en) | 1991-11-21 |
ATE68515T1 (en) | 1991-11-15 |
NO168430C (en) | 1992-02-19 |
FI92478C (en) | 1994-11-25 |
DK167934B1 (en) | 1994-01-03 |
NO874588D0 (en) | 1987-11-03 |
DK592187D0 (en) | 1987-11-12 |
AU7128187A (en) | 1987-10-09 |
NO874588L (en) | 1987-11-03 |
SE452331B (en) | 1987-11-23 |
WO1987005619A1 (en) | 1987-09-24 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19881109 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
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17Q | First examination report despatched |
Effective date: 19890928 |
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