EP0375999B1 - Device for treating articles by UHF energy - Google Patents
Device for treating articles by UHF energy Download PDFInfo
- Publication number
- EP0375999B1 EP0375999B1 EP89122319A EP89122319A EP0375999B1 EP 0375999 B1 EP0375999 B1 EP 0375999B1 EP 89122319 A EP89122319 A EP 89122319A EP 89122319 A EP89122319 A EP 89122319A EP 0375999 B1 EP0375999 B1 EP 0375999B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- uhf
- treatment room
- cover
- energy
- articulation
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/78—Arrangements for continuous movement of material
Definitions
- the invention relates to a device for treating objects with UHF energy, consisting of an elongated treatment room, which is constructed from treatment sections and temperature compensation sections, which is provided on the entrance and exit sides with UHF locks, through which a conveying device runs and on its top and / or underside is provided with feed devices for UHF energy, which are connected to their UHF energy source via waveguides, some parts of the top of the treatment space being designed as hinged covers to the side of the feed devices.
- Such a device has become known from DE-26 42 152, which has a treatment room with a C-shaped cross section, the open side of which can be closed by hinged doors.
- This device has the advantage that UHF energy can be fed into the treatment room from above and from below, and that the treatment room is accessible everywhere for operating and cleaning work.
- the feeders for the UHF energy to the waveguide supplying the UHF energy can, one has accepted the disadvantage that the operating and cleaning work must be carried out in a stooped position. Because UHF treatment rooms are arranged at a height of 60 to 110 cm.
- the invention avoids the disadvantages of the prior art. It is the object of the present invention to provide a system for treating products with UHF energy which, with a simple construction, allows the treatment room to be opened from above over the entire length of the treatment room without the energy coupling causing difficulties.
- the invention consists in that parts of the top of the treatment room with UHF feed devices are designed as hinged or removable covers, and that of the UHF energy source waveguide leading to the UHF feed device has a joint arranged in the axis of the lid hinges in the waveguide, consists of at least two parts that can be detached from one another and is surrounded at the joint location by a trap for UHF energy.
- This device is easy to manufacture and is characterized in that the energy transfer is realized in a simple manner and the system is trouble-free with a long service life. Wear parts such as flexible coaxial conductors are avoided.
- the two waveguides are offset next to one another at the articulation point and have an opening on the mutually facing sides which is surrounded by a mechanical annular joint.
- At least one cover part is provided on at least one side with a microwave trap and covers an adjacent cover part or an end part of the treatment room.
- the treatment room has a single cover which covers both feed points and temperature compensation sections.
- the treatment room is composed of six parts, two of which are designed in the same way.
- the treatment room On the input side, the treatment room has an entrance lock 1, to which a treatment section 2 is connected and to this a temperature compensation section 3. This is followed by a treatment section 2 and then to a temperature compensation section 3.
- These sections forming the treatment room are closed at the end by an exit lock 4.
- Each of these routes is provided with its own cover 5, 6.
- Each lid is attached to two hinges 7.
- the covers 5 of the treatment sections carry a waveguide 8 with two feed points 9 entering the interior of the treatment section.
- the waveguide 8 has two elbows 10 which lead to the articulation point 11 which is arranged coaxially with the joints of the hinges 7.
- Another waveguide 12 leads from this joint point to the UHF energy source 13.
- the cover 5 with its UHF traps 14 covers the adjacent cover 6 of the recreational area 3 or the lock 1, 4.
- the waveguides 8, 12 which are rectangular in cross section, each have a flange 15, indicated by dashed lines, at their ends, which are surrounded by an articulated ring 16 with two inwardly directed flanges.
- This ring 16 is designed as a microwave trap.
- the waveguide 8, 12 are rectangular. When closed, their cross sections are aligned with one another, when open, the cross sections are perpendicular to one another.
- the waveguides 8, 12 each have an opening 17 on the sides facing one another, to which a piece of pipe 18 with a flange 15 connects.
- the two flanges 15 are covered by an articulated ring 16 with inwardly facing flanges.
- This joint ring 16 is designed as a microwave trap.
- the two waveguides 8, 12 are connected with their openings 17 by a metal hose 19.
- a conveyor belt 20 runs through the treatment room as a conveyor device.
- two waveguide parts 21, 22 are inserted one into the other. Both parts have a cross-sectional jump on the inside and outside. Their internal cross-section is identical. The length of the tube sections inserted into each other is a quarter of the wavelength.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- General Preparation And Processing Of Foods (AREA)
- Cleaning In General (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zur Behandlung von Gegenständen mit UHF-Energie, bestehend aus einem langgestreckten Behandlungsraum, der aus Behandlungsstrecken und Temperaturausgleichsstrecken aufgebaut ist, der eingangs- und ausgangsseitig mit UHF-Schleusen versehen ist, durch den eine Fördervorrichtung verläuft und der an seiner Oberseite und/oder Unterseite mit Einspeisungsvorrichtungen für UHF-Energie versehen ist, die über Hohlleiter mit ihrer UHF-Energiequelle verbunden sind, wobei einige Teile der Oberseite des Behandlungsraumes seitlich der Einspeisungsvorrichtungen als abklappbare Deckel ausgebildet sind.The invention relates to a device for treating objects with UHF energy, consisting of an elongated treatment room, which is constructed from treatment sections and temperature compensation sections, which is provided on the entrance and exit sides with UHF locks, through which a conveying device runs and on its top and / or underside is provided with feed devices for UHF energy, which are connected to their UHF energy source via waveguides, some parts of the top of the treatment space being designed as hinged covers to the side of the feed devices.
Eine derartige Vorrichtung ist aus der DE-26 42 152 bekannt geworden, die einen im Querschnitt C-förmigen Behandlungsraum aufweist, dessen offene Seite durch hochklappbare Türen verschließbar ist. Diese Vorrichtung hat den Vorteil, daß in den Behandlungsraum von oben und von unten her UHF-Energie eingespeist werden kann, und daß der Behandlungsraum für Bedienungs- und Reinigungsarbeiten überall zugänglich ist. Um einen festen Anschluß der Einspeisevorrichtungen für die UHF-Energie an die die UHF-Energie zuführenden Hohlleiter haben zu können, hat man den Nachteil in Kauf genommen, daß die Bedienungs- und Reinigungsarbeiten in gebückter Stellung vorgenommen werden müssen. Denn UHF-Behandlungsräume werden in einer Höhe von 60 bis 110 cm angeordnet.Such a device has become known from DE-26 42 152, which has a treatment room with a C-shaped cross section, the open side of which can be closed by hinged doors. This device has the advantage that UHF energy can be fed into the treatment room from above and from below, and that the treatment room is accessible everywhere for operating and cleaning work. In order to have a fixed connection of the feeders for the UHF energy to the waveguide supplying the UHF energy can, one has accepted the disadvantage that the operating and cleaning work must be carried out in a stooped position. Because UHF treatment rooms are arranged at a height of 60 to 110 cm.
Durch die FR-A-25 00 707 ist es bekannt geworden, UHF-Strahler auch im Deckel eines Behandlungsraumes vorzusehen und die Zuleitung der UHF-Energie aus dem zuführenden Hohlleiter über flexible Leiter vorzunehmen, die in einem Wellschlauch einen Koaxialleiter aufweisen. Derartige Koaxialleiter leiden aber, wenn sie sehr oft gebogen werden. Die Umkopplung der UHF-Energie aus einem Hohlleiter in einen Koaxialleiter und aus dem Koaxialleiter wieder in einen weiteren Hohlleiter, wie das bei dieser bekannten Vorrichtung geschieht, ist oftmals mit Schwierigkeiten, Verlusten und Störungen verbunden.From FR-A-25 00 707 it has become known to also provide UHF radiators in the cover of a treatment room and to supply the UHF energy from the supplying waveguide via flexible conductors which have a coaxial conductor in a corrugated hose. However, such coaxial conductors suffer if they are bent very often. The coupling of the UHF energy from a waveguide into a coaxial conductor and from the coaxial conductor back into another waveguide, as is done in this known device, is often associated with difficulties, losses and disturbances.
Die Erfindung vermeidet die Nachteile des Standes der Technik. Es ist die Aufgabe der vorliegenden Erfindung, eine Anlage zur Behandlung von Produkten mit UHF-Energie zu schaffen, die bei einfachem Aufbau eine Öffnung des Behandlungsraumes von oben her über die gesamte Länge des Behandlungsraumes gestattet, ohne daß die Energieankopplung Schwierigkeiten bereitet.The invention avoids the disadvantages of the prior art. It is the object of the present invention to provide a system for treating products with UHF energy which, with a simple construction, allows the treatment room to be opened from above over the entire length of the treatment room without the energy coupling causing difficulties.
Die Erfindung besteht darin, daß auch Teile der Oberseite des Behandlungsraumes mit UHF-Einspeisungsvorrichtungen als abklappbare oder abnehmbare Deckel ausgebildet sind, und daß der von der UHF-Energiequelle zur UHF-Einspeisungsvorrichtung führende Hohlleiter ein in der Achse der Deckelscharniere angeordnetes Gelenk im Hohlleiter aufweist, aus mindestens zwei voneinander lösbaren Teilen besteht und an der Gelenkstelle von einer Falle für UHF-Energie umgeben ist.The invention consists in that parts of the top of the treatment room with UHF feed devices are designed as hinged or removable covers, and that of the UHF energy source waveguide leading to the UHF feed device has a joint arranged in the axis of the lid hinges in the waveguide, consists of at least two parts that can be detached from one another and is surrounded at the joint location by a trap for UHF energy.
Diese Vorrichtung ist leicht herstellbar und zeichnet sich dadurch aus, daß der Energieübergang in einfacher Weise realisiert ist, und die Anlage bei langer Lebensdauer störungsfrei ist. Verschleißteile, wie flexible Koaxialleiter, sind hierbei vermieden.This device is easy to manufacture and is characterized in that the energy transfer is realized in a simple manner and the system is trouble-free with a long service life. Wear parts such as flexible coaxial conductors are avoided.
Baulich besonders einfach und sehr vorteilhaft ist es, wenn die beiden Hohlleiterteile an der Gelenkstelle mit Flanschen aneinander anliegen. Das gewährleistet einen guten Energieübergang und eine verschleißfreie Ausführung des Gelenkes.It is structurally particularly simple and very advantageous if the two waveguide parts abut one another with flanges at the joint. This ensures a good energy transfer and a wear-free design of the joint.
Eine andere Möglichkeit der Ausführung besteht darin, daß die beiden Hohlleiter an der Gelenkstelle versetzt nebeneinander angeordnet sind und auf den einander zugekehrten Seiten eine Öffnung aufweisen, die von einem mechanischen ringförmigen Gelenk umgeben ist.Another possible embodiment is that the two waveguides are offset next to one another at the articulation point and have an opening on the mutually facing sides which is surrounded by a mechanical annular joint.
Damit der Behandlungsraum im Betrieb völlig mikrowellendicht ist, ist es zweckmäßig, wenn zumindest ein Deckelteil an mindestens einer Seite mit einer Mikrowellenfalle versehen ist und mit dieser ein benachbartes Deckelteil oder eine Endteil des Behandlungsraumes überfaßt.So that the treatment room is completely microwave-proof during operation, it is expedient if at least one cover part is provided on at least one side with a microwave trap and covers an adjacent cover part or an end part of the treatment room.
Für manche Anwendungsfälle ist es zweckmäßig, wenn der Behandlungsraum einen einzigen, sowohl Einspeisestellen als auch Temperaturausgleichsstrecken überfassenden Deckel aufweist.For some applications, it is expedient if the treatment room has a single cover which covers both feed points and temperature compensation sections.
Weiter ist es aus baulichen Gründen zweckmäßig, wenn je Magnetron mindestens eine Verzweigung zu verschiedenen Einspeisestellen vorgesehen ist, und wenn von einem Magnetron gespeiste Einspeisestellen einem Deckel zugeordnet sind.It is also expedient for structural reasons if at least one branch to different feed points is provided for each magnetron, and if feed points fed by a magnetron are assigned to a cover.
Das Wesen der vorliegenden Erfindung ist nachstehend anhand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:
- Fig. 1
- eine Seitenansicht des Behandlungsraumes,
- Fig. 2
- eine Ansicht von oben auf den geschlossenen Behandlungsraum,
- Fig. 3
- eine Ansicht von oben auf den geöffneten Behandlungsraum,
- Fig. 4
- die Ansicht eines mit Gelenk versehenen Hohlleiters in der Betriebsstellung,
- Fig. 5
- in Offenstellung,
- Fig. 6
- eine andere Ansicht des Hohlleitergelenkes,
- Fig. 7
- eine Metallschlauchverbindung zweier Hohlleiter an der Gelenkstelle,
- Fig. 8
- einen Querschnitt durch eine Gelenkstelle, die aus zwei ineinander geschobenen Hohlleiterteilen besteht.
- Fig. 1
- a side view of the treatment room,
- Fig. 2
- a top view of the closed treatment room,
- Fig. 3
- a top view of the open treatment room,
- Fig. 4
- the view of an articulated waveguide in the operating position,
- Fig. 5
- in open position,
- Fig. 6
- another view of the waveguide joint,
- Fig. 7
- a metal hose connection between two waveguides at the joint,
- Fig. 8
- a cross section through an articulation point, which consists of two nested waveguide parts.
Der Behandlungsraum ist aus sechs Teilen zusammengebaut, von denen jeweils zwei in gleicher Weise gestaltet sind. Eingangsseitig weist der Behandlungsraum eine Eingangsschleuse 1 auf, an diese ist eine Behandlungsstrecke 2 angeschlossen und an diese eine Temperaturausgleichsstrecke 3. An diese schließt sich wieder eine Behandlungsstrecke 2 und an diese dann eine Temperaturausgleichsstrecke 3 an. Diese den Behandlungsraum bildenden Strecken sind am Ende durch eine Ausgangsschleuse 4 abgeschlossen. Jede dieser Strecken ist mit einem eigenen Deckel 5, 6 versehen. Jeder Deckel ist an zwei Scharnieren 7 angebracht. Die Deckel 5 der Behandlungsstrecken tragen einen Hohlleiter 8 mit zwei in das Innere der Behandlungsstrecke einlaufenden Einspeisungsstellen 9. Der Hohlleiter 8 weist zwei Krümmer 10 auf, die zu der Gelenkstelle 11 führen, die gleichachsig mit den Gelenken der Scharniere 7 angeordnet ist. Von dieser Gelenkstelle führt ein weiterer Hohlleiter 12 zur UHF-Energiequelle 13.The treatment room is composed of six parts, two of which are designed in the same way. On the input side, the treatment room has an
Beidseitig überfaßt der Deckel 5 mit seinen UHF-Fallen 14 den benachbarten Deckel 6 der Erholungsstrecke 3 bzw. die Schleuse 1, 4.On both sides, the
Dieses Gelenk läßt sich in verschiedenen Ausführungsformen herstellen. Im Ausführungsbeispiel der Fig. 4 und 5 weisen die im Querschnitt rechteckigen Hohlleiter 8, 12 an ihren Enden je einen gestrichelt angedeuteten Flansch 15 auf, welche von einem Gelenkring 16 mit zwei nach innen gerichteten Flanschen umgeben sind. Dieser Ring 16 ist als Mikrowellenfalle ausgebildet. Die Hohlleiter 8, 12 sind rechteckig. Im geschlossenen Zustand fluchten ihre Querschnitte miteinander, im geöffneten Zustand stehen die Querschnitte senkrecht zueinander.This joint can be manufactured in various embodiments. In the exemplary embodiment of FIGS. 4 and 5, the
Im Ausführungsbeispiel der Fig. 6 weisen die Hohlleiter 8, 12 auf den einander zugekehrten Seiten je eine Öffnung 17 auf, an die sich ein Rohrstück 18 mit einem Flansch 15 anschließt. Die beiden Flansche 15 sind durch einen Gelenkring 16 mit nach innen weisenden Flanschen überfaßt. Dieser Gelenkring 16 ist als Mikrowellenfalle ausgebildet.In the exemplary embodiment in FIG. 6, the
Im Ausführungsbeispiel der Fig. 7 sind die beiden Hohlleiter 8, 12 mit ihren Öffnungen 17 durch einen Metallschlauch 19 verbunden.In the exemplary embodiment in FIG. 7, the two
Durch den Behandlungsraum verläuft als Fördervorrichtung ein Förderband 20.A
Im Ausführungsbeispiel der Fig. 8 sind zwei Hohlleiterteile 21, 22 ineinandergesteckt. Beide Teile weisen einen Querschnittssprung innen bzw. außen auf. Ihr Innenquerschnitt ist identisch. Die Länge der ineinander gesteckten Rohrpartien beträgt ein Viertel der Wellenlänge.In the exemplary embodiment in FIG. 8, two
- 11
- EingangsschleuseEntrance lock
- 22nd
- BehandlungsstreckeTreatment line
- 33rd
- ErholungsstreckeRecreational route
- 44th
- AusgangsschleuseExit gate
- 55
- Deckelcover
- 66
- Deckelcover
- 77
- Scharnierhinge
- 88th
- HohlleiterWaveguide
- 99
- EinspeisungsstelleInfeed point
- 1010th
- KrümmerManifold
- 1111
- GelenkstelleJoint
- 1212th
- HohlleiterWaveguide
- 1313
- UHF-EnergiequelleUHF energy source
- 1414
- UHF-FalleUHF trap
- 1515
- Flanschflange
- 1616
- GelenkringJoint ring
- 1717th
- Öffnungopening
- 1818th
- RohrstückPipe piece
- 1919th
- MetallschlauchMetal hose
- 2020th
- FörderbandConveyor belt
- 2121
- HohlleiterteilWaveguide part
- 2222
- HohlleiterteilWaveguide part
Claims (7)
- Apparatus for the treatment of products with UHF-energy, consisting of a long treatment room (2,3) which consists of treatment sections (2,3) and temperature compensation sections (3), provided at the inlet and outlet side with UHF-locks (1,4) where a conveying device (20) is running and which is provided with feeding devices (9) for the UHF-energy at its upper side and/or lower side,
which are connected with their UHF-energy source by means of wave guide (12), whereby some parts of the upper side of the treatment room on the side of the feeding devices (9) are forming flapping cover (5,6)
characterized in that
further parts (2) of the upper part of the treatment room (2,3) are provided with UHF-feeding devices (9) forming flapping or removing covers (5) and that the wave guide (8,12) going from the UHF-energy source (13) to the UHF-feeding devices (9) is effected by an articulation (11) in the axis of the hinges of the covers, consists at least of two separable parts and at the articulation (11) is surrounded with a trap (16) for the UHF-energy. - Apparatus according to claim 1,
characterized in that
the two wave guides (8,12) are near another on the articulation point (11) with flanges (15). - Apparatus according to claim 1,
characterized in that
the wave guides (8,12) are transposed close together on the articulation point (11) and have an opening (17) on the opposite sides, which is surrounded with a mechanical articulation in form of a ring (15, 16, 18). - Apparatus according to claim 1,
characterized in that at least a cover (5) is equipped at least on a side with a micro-wave trap (14) and superposed with it on adjacent cover (6) or a final part of the treatment room. - Apparatus according to claim 1, characterized in that the treatment room (2,3) has only a cover superposing the feeding point as well as the temperature compensation sections (3).
- Apparatus according to claim 1, characterized in that for each magnetron it is provided at least a branching on various feeding points and the feeding points fed by a magnetron (13) have a cover.
- Apparatus according to claim 1, characterized in that the articulation point (11) in the wave guide consists of two parts of the wawe guide (8,12) pushed together, having a round section, preferably a constant inner section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3843904 | 1988-12-24 | ||
| DE3843904A DE3843904A1 (en) | 1988-12-24 | 1988-12-24 | DEVICE FOR TREATING OBJECTS WITH UHF ENERGY |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0375999A2 EP0375999A2 (en) | 1990-07-04 |
| EP0375999A3 EP0375999A3 (en) | 1991-08-07 |
| EP0375999B1 true EP0375999B1 (en) | 1994-12-07 |
Family
ID=6370267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89122319A Expired - Lifetime EP0375999B1 (en) | 1988-12-24 | 1989-12-04 | Device for treating articles by UHF energy |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5049362A (en) |
| EP (1) | EP0375999B1 (en) |
| JP (1) | JPH02267886A (en) |
| DD (1) | DD286415A5 (en) |
| DE (1) | DE3843904A1 (en) |
| ES (1) | ES2067522T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4143541C2 (en) * | 1991-02-19 | 1999-03-04 | Mls Gmbh | High pressure reaction appts. for microwave-assisted reaction |
| US8679401B2 (en) * | 2009-07-15 | 2014-03-25 | Microzap, Inc. | Microwave disinfection and sterilization |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2603741A (en) * | 1946-12-12 | 1952-07-15 | Goodrich Co B F | High-frequency heating |
| US3916137A (en) * | 1974-05-20 | 1975-10-28 | Gerling Moore Inc | Multi-mode microwave cavity feed system |
| CH586881A5 (en) * | 1975-05-21 | 1977-04-15 | Kreis Ag | |
| GB1502262A (en) * | 1975-07-01 | 1978-03-01 | Thorn Electrical Ind Ltd | Micro-wave heating apparatus |
| FR2327700A1 (en) * | 1975-10-09 | 1977-05-06 | Meisel Nicolas | MICROWAVE TUNNEL OVEN FOR CONTINUOUS PROCESSING OF FOOD PRODUCTS |
| US4492839A (en) * | 1976-05-19 | 1985-01-08 | Smith Donald P | Thermal treatment apparatus |
| US4176267A (en) * | 1978-05-12 | 1979-11-27 | Armstrong Cork Company | Microwave energy trap |
| FR2500707A1 (en) * | 1981-02-20 | 1982-08-27 | Electricite De France | Microwave material processor with detachable radiating elements - uses waveguide coupler with coaxial tappings along its length to permit fitting of different radiating elements |
| FR2521810A1 (en) * | 1982-02-16 | 1983-08-19 | Technics Lambda Internal | Multiple mode microwave tunnel oven - for continuous elastomeric profiles, avoids overheating differing profile shapes or sizes |
| DE3405542A1 (en) * | 1984-02-16 | 1985-09-05 | Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover | MICROWAVE PERFORMANCE |
| US4570045A (en) * | 1984-03-08 | 1986-02-11 | Jeppson Morris R | Conveyorized microwave heating chamber with dielectric wall structure |
| US4687895A (en) * | 1984-07-30 | 1987-08-18 | Superwave Technology, Inc. | Conveyorized microwave heating system |
| DE3806816A1 (en) * | 1987-04-15 | 1988-11-03 | Berstorff Gmbh Masch Hermann | Device for uniformly and rapidly heating, pasteurising, or sterilising food or the like |
| DE8816056U1 (en) * | 1988-12-24 | 1989-02-23 | Paul Troester Maschinenfabrik, 3000 Hannover | Device for treating objects with UHF energy |
-
1988
- 1988-12-24 DE DE3843904A patent/DE3843904A1/en active Granted
-
1989
- 1989-12-04 ES ES89122319T patent/ES2067522T3/en not_active Expired - Lifetime
- 1989-12-04 EP EP89122319A patent/EP0375999B1/en not_active Expired - Lifetime
- 1989-12-20 US US07/454,743 patent/US5049362A/en not_active Expired - Fee Related
- 1989-12-22 DD DD89336240A patent/DD286415A5/en not_active IP Right Cessation
- 1989-12-25 JP JP1336172A patent/JPH02267886A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3843904A1 (en) | 1990-06-28 |
| US5049362A (en) | 1991-09-17 |
| EP0375999A2 (en) | 1990-07-04 |
| DE3843904C2 (en) | 1990-10-04 |
| ES2067522T3 (en) | 1995-04-01 |
| DD286415A5 (en) | 1991-01-24 |
| EP0375999A3 (en) | 1991-08-07 |
| JPH02267886A (en) | 1990-11-01 |
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