DE3142747C2 - Perforated metal foil made of a heavy metal coated with a metal layer as a filter - Google Patents
Perforated metal foil made of a heavy metal coated with a metal layer as a filterInfo
- Publication number
- DE3142747C2 DE3142747C2 DE3142747A DE3142747A DE3142747C2 DE 3142747 C2 DE3142747 C2 DE 3142747C2 DE 3142747 A DE3142747 A DE 3142747A DE 3142747 A DE3142747 A DE 3142747A DE 3142747 C2 DE3142747 C2 DE 3142747C2
- Authority
- DE
- Germany
- Prior art keywords
- layer
- metal
- metal foil
- nickel
- filter
- 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
- 239000011888 foil Substances 0.000 title claims abstract description 19
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 title claims description 18
- 239000002184 metal Substances 0.000 title claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000013305 food Nutrition 0.000 claims abstract description 7
- 210000001124 body fluid Anatomy 0.000 claims abstract description 5
- 239000010839 body fluid Substances 0.000 claims abstract description 5
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 4
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims 2
- 238000000576 coating method Methods 0.000 claims 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- ZRUWFKRETRELPY-UHFFFAOYSA-N azane;nickel(2+) Chemical compound N.[Ni+2] ZRUWFKRETRELPY-UHFFFAOYSA-N 0.000 description 1
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/44—Parts or details or accessories of beverage-making apparatus
- A47J31/4403—Constructional details
- A47J31/446—Filter holding means; Attachment of filters to beverage-making apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/012—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
- B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
- B26B19/384—Dry-shaver foils; Manufacture thereof
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/60—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of tin
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/18—Filters characterised by the openings or pores
- B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
- Filtering Materials (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Apparatus For Making Beverages (AREA)
Abstract
Eine perforierte Schwermetallfolie, die mit Nahrungsmitteln, Genußmitteln, Körperflüssigkeiten oder der Haut in Berührung kommen kann, ist mit einer Schicht einer intermetallischen Verbindung aus Zinn und Nickel überzogen. Diese Schicht kann zusätzlich mit einer dünnen Edelmetallschicht überzogen sein.A perforated heavy metal foil, which can come into contact with food, luxury foods, body fluids or the skin, is coated with a layer of an intermetallic compound made of tin and nickel. This layer can also be covered with a thin layer of noble metal.
Description
Die Erfindung betrifft eine perforierte, mit einer metallenen Schicht überzogene Metallfolie aus einem Schwermetall als Filter für Nahrungsmittel, Genußmittel und Körperflüssigkeiten und als Scherblatt für Trokkenrasierer. The invention relates to a perforated metal foil coated with a metal layer made of a Heavy metal as a filter for food, luxury items and body fluids and as a blade for dry razors.
Es ist bereits eine derartige Metallfolie bekannt, die mit einer metallenen Schicht überzogen ist. Diese Schicht dient jedoch nur dazu, die Perforationen bis auf eine gewünschte Größe zu verkleinern (GB-PS 6 34 217).It is already known such a metal foil that is covered with a metallic layer. This layer only serves to keep the perforations up to reduce a desired size (GB-PS 6 34 217).
Bei derartigen Metallfolien hat es sich jedoch als nachteilig erwiesen, daß bei Verwendung von giftigen Schwermetallen wie etwa Nickel bei Berührung mit Nahrungsmitteln oder der Haut gesundheitsschädliche Mengen des giftigen Schwermetalls in Lösung gehen bzw. absorbiert werden können, welcher Nachteil bisher nur durch die Verwendung von kostspieligen, ausreichend dicken Sperrschichten aus Edelmetall, etwa Gold, Platin oder Rhodium, beseitigt werden kann.In such metal foils, however, it has proven to be disadvantageous that when using toxic Heavy metals such as nickel are harmful to health when they come into contact with food or the skin Quantities of the toxic heavy metal can go into solution or be absorbed, which is a disadvantage so far only through the use of expensive, sufficiently thick barrier layers made of precious metal, for example Gold, platinum, or rhodium, can be eliminated.
Der Erfindung liegt die Aufgabe zugrunde, die bekannte Metallfolie derart weiterzuentwickeln, daß die kostspielige Verwendung von Edelmetallen für die Schicht entbehrlich wird oder stark eingeschränkt werden kann, ohne daß bei der Berührung der Metallfolie mit Nahrungsmitteln, Genußmitteln, Körperflüssigkeiten oder der menschlichen Haut gesundheitsschädliche Mengen eines giftigen Schwermetalls in Lösung gehen.The invention is based on the object of further developing the known metal foil in such a way that the costly use of precious metals for the layer becomes dispensable or severely restricted can without touching the metal foil with food, luxury items, body fluids or quantities of a toxic heavy metal that are harmful to human health go into solution.
Die Lösung dieser Aufgabe ist darin zu sehen, daß die Schicht eine intermetallische Verbindung aus Zinn und Nickel von mindestens 0,5 μηι Stärke ist, wobei der Zinngehalt der Schicht etwa 65% beträgtThe solution to this problem is to be seen in the fact that the layer is an intermetallic compound of tin and Nickel is at least 0.5 μm thick, the Tin content of the layer is about 65%
Es ist zwar bereits bekannt, intermetallische Schichten zu verwenden (DE-AS 10 80 372), allerdings nicht im Zusammenhang mit der Beeinflussung der Löslichkeit giftiger Schwermetalle.It is already known to use intermetallic layers (DE-AS 10 80 372), but not in Relationship with influencing the solubility of toxic heavy metals.
Weiterbildungen ergeben sich aus den Unteransprüchen. Further developments result from the subclaims.
Die Erfindung ist im folgenden anhand schematischer Zeichnungen an einem Ausführungsbeispiel näher beschrieben. The invention is described in more detail below with reference to schematic drawings using an exemplary embodiment.
F i g. 1 ist eine Draufsicht auf einen Teil einer Filterfolie für Kaffeefilter, undF i g. Figure 1 is a plan view of part of a filter sheet for coffee filters, and
F i g. 2 ist ein Schnitt längs der Linie II-II von F i g. 1. Fig. 1 zeigt einen Ausschnitt aus einer perforierten s Metallfolie 1, die mit Perforationen 2 versehen ist, weiche als Längsschlitze mit einer Breite von 50 bis 100 μπι und einer Länge von etwa 3 mm ausgebildet sind.F i g. Figure 2 is a section along line II-II of Figure 2. 1. Fig. 1 shows a section from a perforated s metal foil 1, which is provided with perforations 2, soft as longitudinal slots with a width of 50 to 100 μπι and a length of about 3 mm.
Die Metallfolie besteht aus einer Basisfolie 3 aus Nikkei, welche allseitig mit einer Schicht 4 aus einer einphaic sigen intermetallischen Verbindung von Zinn und Nikkei überzogen ist Der Nickelgehalt dieser Schicht beträgt etwa 35% und der Zinngehalt dementsprechend 65%.The metal foil consists of a base foil 3 made of Nikkei, which on all sides with a layer 4 of a einphaic denominated intermetallic compound of tin and Nikkei The nickel content of this layer is about 35% and the tin content accordingly 65%.
Die Schicht kann auf beliebige Weise auf die Basisfo-Ue 3 aufgebracht sein, etwa aus einem galvanischen Bad. Die Dicke der Schicht 4 beträgt zwischen 1 und 3 um. Geringere Schichtdicken als 0,5 μπι führen dazu, daß zuviel Nickel in Lösung geht und/oder daß die Lebensdauer der Schicht begrenzt ist. Größere Schichtdicken als 6 μηι sind zur Erzielung der günstigen Eigenschaften nicht erforderlich und daher nicht anzustreben, da die Verweilzeit der Basisfolie in dem galvanischen Bad dadurch unnötig lang wird.The layer can be applied to the base film 3 in any desired manner, for example from an electroplating bath. The thickness of the layer 4 is between 1 and 3 µm. Layer thicknesses less than 0.5 μm lead to the fact that too much nickel goes into solution and / or that the life of the layer is limited. Larger layer thicknesses than 6 μηι are to achieve the favorable properties not necessary and therefore not desirable, since this reduces the dwell time of the base film in the electroplating bath becomes unnecessarily long.
Zum galvanischen Auftragen der Zinn/Nickelschicht wird beispielsweise ein Bad verwendet mit folgender Zusammensetzung:For the galvanic application of the tin / nickel layer, for example, a bath is used with the following Composition:
Zinnchlorid (SnCl2 · 2 H2O)
zweiwertiges ZinnTin chloride (SnCl 2 2 H 2 O)
divalent tin
Nickelchlorid (NiCl2 · 6 H2O)
Nickel
Ammoniumbifluorid(NH<.F · HF) (Ammoniumhydrogenfluorid) Ammoniumhydroxid-Lösung
(NH3 35% Sp.gr. 880)Nickel chloride (NiCl 2 · 6 H 2 O) nickel
Ammonium bifluoride (NH <.F · HF) (ammonium hydrogen fluoride) ammonium hydroxide solution (NH 3 35% Sp.gr. 880)
5050
25 25025 250
6060
4040
35 ml/135 ml / 1
Das Bad wird mit einer Nickelanode betrieben bei einer Temperatur von 70° C und einer Stromdichte von etwa 2,5 A/dm2. Die Abscheidegeschwindigkeit beträgt dabei etwa 1 μπι pro Minute.The bath is operated with a nickel anode at a temperature of 70 ° C. and a current density of about 2.5 A / dm 2 . The deposition rate is about 1 μm per minute.
Zum Herstellen der Schicht können jedoch auch beliebige andere bekannte Bäder verwendet werden. Bei Verwendung der Metallfolie als Siebfolie für Kaffeefilter hat sich gezeigt, daß der Anteil von Nickel, das in Lösung geht, falls die Basisfolie aus Nickel besteht, durch die Schicht 4 um den Faktor 100 bis 135 verringert wird gegenüber einer unbehandelten Nickelfolie.However, any other known baths can also be used to produce the layer. When using the metal foil as a sieve film for coffee filters, it has been shown that the proportion of nickel that goes into solution, if the base foil is made of nickel, reduced by the layer 4 by a factor of 100 to 135 is compared to an untreated nickel foil.
so ist, kann auf die Schicht 4 zusätzlich eine Edelmetallschicht,
etwa eine Goldschicht 5 aufgebracht sein. Eine derartige Siebfolie hat den Vorteil, daß die Goldschicht
verhältnismäßig dünn sein kann, da sie nicht als Sperrschicht für Nickel zu wirken braucht, sondern lediglich
für eine Geschmacksneutralität der Siebfolie sorgen soll sowie in gewissem Umfang für eine zusätzliche antikorrosive
Wirkung. Auch läßt sieb eine Goldschicht einfacher sauber halten.
Die Erfindung ist nicht auf die Verwendung von Nikkel für die Basisfolie beschränkt, sondern kann vielmehr
auch bei anderen Metallen verwendet werden, bei denen eine zu große Konzentration in Lebens- oder Genußmitteln
bedenklich ist oder die Berührung mit der Haut oder mit Körperflüssigkeiten nachteilig ist.is so, a noble metal layer, for example a gold layer 5, can additionally be applied to the layer 4. Such a screen foil has the advantage that the gold layer can be relatively thin, since it does not have to act as a barrier layer for nickel, but is only intended to ensure that the screen foil is tasteless and to a certain extent for an additional anti-corrosive effect. A layer of gold also makes it easier to keep clean.
The invention is not limited to the use of nickel for the base film, but can also be used with other metals in which too high a concentration in foodstuffs or luxury foods is a concern or contact with the skin or body fluids is disadvantageous.
Die Basisfolie kann auf verschiedene Weise hergestellt sein, etwa durch Ätzen, Stanzen oder durch Abscheiden aus einem galvanischen Bad.The base film can be produced in various ways, for example by etching, stamping or by deposition from a galvanic bath.
Claims (5)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3142747A DE3142747C2 (en) | 1981-10-28 | 1981-10-28 | Perforated metal foil made of a heavy metal coated with a metal layer as a filter |
| FR8217260A FR2515060A1 (en) | 1981-10-28 | 1982-10-15 | PERFORATED METAL SHEET |
| GB08230680A GB2108154A (en) | 1981-10-28 | 1982-10-27 | Coated heavy metal filters |
| JP57188893A JPS5881993A (en) | 1981-10-28 | 1982-10-27 | Perforated metal foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3142747A DE3142747C2 (en) | 1981-10-28 | 1981-10-28 | Perforated metal foil made of a heavy metal coated with a metal layer as a filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3142747A1 DE3142747A1 (en) | 1983-05-11 |
| DE3142747C2 true DE3142747C2 (en) | 1985-06-27 |
Family
ID=6145037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3142747A Expired DE3142747C2 (en) | 1981-10-28 | 1981-10-28 | Perforated metal foil made of a heavy metal coated with a metal layer as a filter |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5881993A (en) |
| DE (1) | DE3142747C2 (en) |
| FR (1) | FR2515060A1 (en) |
| GB (1) | GB2108154A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3441970C1 (en) * | 1984-11-16 | 1986-02-13 | Maxs Ag, Sachseln | Metal filter foil |
| DE3800967A1 (en) * | 1988-01-15 | 1989-07-27 | Moser Gmbh Kuno | Electric shaver with coated cutting foil and method for applying a cutting-foil coating |
| US4834876A (en) * | 1988-03-14 | 1989-05-30 | Walker Nicholas G | Filtration assembly having integral heating means for maintaining the metallic material being filtered in the molten state |
| DE8904527U1 (en) * | 1989-04-11 | 1989-11-30 | B. Braun Melsungen Ag, 3508 Melsungen | Port for drug injection |
| US5324301A (en) * | 1992-09-28 | 1994-06-28 | Smith & Nephew Dyonics, Inc. | Surgical cutting instrument with tin-nickle alloy coating as an elongate bearing surface |
| JP3100254B2 (en) * | 1993-01-28 | 2000-10-16 | 江南特殊産業株式会社 | Three-dimensional electroformed shell for mold and method of manufacturing the same |
| GB2354459B (en) * | 1999-09-22 | 2001-11-28 | Viostyle Ltd | Filtering element for treating liquids, dusts and exhaust gases of internal combustion engines |
| US20090260522A1 (en) * | 2006-09-20 | 2009-10-22 | Jens Brine | Portafilter for espresso machine |
| NL2013035B1 (en) | 2014-06-19 | 2016-07-06 | Veco B V | Coated shaving foil. |
| NL2015934B1 (en) * | 2015-12-10 | 2017-07-03 | Veco B V | Filter for brewing beverages. |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB634217A (en) * | 1947-05-08 | 1950-03-15 | John Kilner Wells | Improvements in and relating to sieves, perforate screens, or filter plates |
| DE1080372B (en) * | 1956-08-29 | 1960-04-21 | Johanna Muck Geb Roth | Process for the galvanic production of shaving foils for dry razors |
| DE1553740C3 (en) * | 1967-09-25 | 1975-10-23 | The Gillette Co., Boston, Mass. (V.St.A.) | Perforated cutting foil for dry razors |
| DE1983538U (en) * | 1968-02-16 | 1968-04-18 | Knut Goesta Larsson | SIEVE FOR STRENGTH PENSIONS. |
| US3573008A (en) * | 1968-05-02 | 1971-03-30 | Hudson Wire Co | Composite metal article of copper material with a coat of nickel and tin |
| FR1582091A (en) * | 1968-05-30 | 1969-09-26 | ||
| BE757810A (en) * | 1969-10-24 | 1971-04-21 | Kalle Ag | PROCESS FOR MANUFACTURING A POROUS FLAT LAMINATE MATERIAL |
| FR2088188B1 (en) * | 1970-05-26 | 1974-08-09 | Honeywell Bull Soc Ind | |
| DE2153901C3 (en) * | 1971-10-28 | 1979-12-20 | Elfo Ag Sachseln, Sachseln (Schweiz) | Screen moldings |
| US3884116A (en) * | 1971-12-15 | 1975-05-20 | Midwest Chrome Process Company | Screw threaded fastening means and like products |
| US3871836A (en) * | 1972-12-20 | 1975-03-18 | Allied Chem | Cutting blades made of or coated with an amorphous metal |
| CH608975A5 (en) * | 1976-09-30 | 1979-02-15 | Bopp & Co Ag G | Metal filter cloth, in particular for precoated filters |
| FR2421676A1 (en) * | 1978-04-03 | 1979-11-02 | Balco Filtertechnik Gmbh | PROCESS FOR MANUFACTURING CONICAL PERFORATED METAL BODIES FOR CENTRIFUGES AND PERFORATED BODIES OBTAINED BY THIS PROCESS |
| DE7837658U1 (en) * | 1978-12-20 | 1979-04-12 | Richard Steding & Co, 5880 Luedenscheid | Filters for brewing beverages |
| DE8004003U1 (en) * | 1980-02-15 | 1980-05-29 | Steding, Richard, 5880 Luedenscheid | DEVICE FOR SEPARATING SOLID PARTICLES AND LIQUID |
-
1981
- 1981-10-28 DE DE3142747A patent/DE3142747C2/en not_active Expired
-
1982
- 1982-10-15 FR FR8217260A patent/FR2515060A1/en not_active Withdrawn
- 1982-10-27 GB GB08230680A patent/GB2108154A/en not_active Withdrawn
- 1982-10-27 JP JP57188893A patent/JPS5881993A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3142747A1 (en) | 1983-05-11 |
| GB2108154A (en) | 1983-05-11 |
| FR2515060A1 (en) | 1983-04-29 |
| JPS5881993A (en) | 1983-05-17 |
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