US2750658A - Wire-shaped object - Google Patents

Wire-shaped object Download PDF

Info

Publication number
US2750658A
US2750658A US248042A US24804251A US2750658A US 2750658 A US2750658 A US 2750658A US 248042 A US248042 A US 248042A US 24804251 A US24804251 A US 24804251A US 2750658 A US2750658 A US 2750658A
Authority
US
United States
Prior art keywords
wire
sheath
powder
magnetic
particles
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
Application number
US248042A
Inventor
Went Jan Jacobus
Vermeulen Roelof
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2750658A publication Critical patent/US2750658A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/923—Physical dimension
    • Y10S428/924—Composite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/923—Physical dimension
    • Y10S428/924—Composite
    • Y10S428/925—Relative dimension specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/928—Magnetic property
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y10T428/12069—Plural nonparticulate metal components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y10T428/12097—Nonparticulate component encloses particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y10T428/12757—Fe

Definitions

  • the invention relates to wire-shaped objects comprising a core and a sheath arranged at a certain distance concentrically thereto, these two parts being preferably made of the same material, the space between the core and the sheath comprising a finely divided powder.
  • the powder is made of electrically insulating material, for example as a resistance wire in resistors, an indirectly heated cathode in a highvacuum tube, or as wire capacitors.
  • the construction described makes it possible to manufacture wires of a few tenths of millimeters in thickness in a comparatively simple and cheap manner, i. e. by a series of mechanical operations such, for example, as hammering and subsequent drawing or rolling.
  • the powder is made of permanently magnetizable, ferromagnetic material
  • the mau terial for the core and the sheath is aluminium or a material, for example a weak kind of copper similar to the former as regards deformability in the cold state and mechanical strength.
  • the object according to the invention is particularly suitable to be used as a carrier of magnetic records.
  • the choice of the sheath material from the series of materials suggested before, for example, nickel, molybdenum or aluminium is based on the recognition of the fact that during the mechanical operations the intermediate heattreatments of the Wire as are required with other sheath materials such as nickel or molybdenum should not detract from the magnetic properties of the powder.
  • aluminium is deformable in cold condition to the degree required for the present case, without becoming brittle and without being cracked or broken, it is well suited for use as sheath material for carriers of magnetic records according to the invention.
  • the use of a weak kind of copper may require an intermediate heat-treatment; in this case the temperature should not exceed 150 C. in order to avoid sintering of the powder and hence a diminution of the magnetic properties.
  • the core is made of the same material as used for the sheath.
  • the ferromagnetic powder layer to be used for recording or to be provided with records is protected by a sheath.
  • the provision of the sheath has a further advantage in that a binder is not required, so that the filling factor of the space between the core and the sheath may be very high. Since wire-shaped carriers of magnetic records are known to be wound on a reel, the known wire-shaped carriers, in which the ferromagnetic material forms the sheath, bring about the risk of cross-talk owing to the relative contact between adjacent turns.
  • wire-shaped objects a cord ng t he invention wi h th QOnventiQIlfl diam te of wire-shaped carriers of magnetic records lying bet "een 0.2 and 0.05 mm. and with a magnetic powder havlng a coercive force of at least 300 oersted, the powder according to h i ention h s Par i e mag itude not more than 2 the thickness of the layer being about one en h of h ter wire ame r- Th ch i e m n mum value of the coercive force is connected with the well-known fact that at high frequencies the recording sensitiveness increases with an increasing value of the coercive force.
  • the choice ofthe thickness of the powder yer is on ected th, h ne d o ha n the g a pos l mogenei y of. the stray fie dof he. record head throughout the thickness of the magnetic layer.
  • the use of particles smaller than 2 1. in a wire having an outer diameter of between 0.2 and 0.05 mm., in which the layer thickness is onetenth of the outer diameter has the advantage that a comparatively great plurality of particles may be provided in the layer. An excessively small plurality of particles per unit of length of the Wire would harmfully aifect the noise. It will be obvious that in each case in practice with a particular wire diameter the maximum particle size and the layer thickness have to be adjusted to one another, in accordance with the noise required.
  • the separate particles may have an extremely high coercive force, if iron, iron alloys, nickel, cobalt and so forth or oxides thereof are in a very finely divided condition with a particle size of less than 2,u.. It is known to utilize this particle size with the manufacture of powdery magnets and to mould the powder in the desired shape at a temperature at which sintering does not occur. It is furthermore known to use such powdery materials on or in stripshaped carriers of magnetic records. However, in this case it is found that, as stated above, one has to be satisfied either with a lower value of the coercive force of the particles or with a higher noise level. Carriers according to the invention in which use is made of the said powdery materials, are free from these disadvantages, since owing to the construction of the carrier the particles are strongly compressed in a very homogeneous distribution without the use of a binder.
  • the drawing shows a core 1 of pure aluminium and a sheath 2 arranged to surround the core concentrically at a certain distance and made of the same material, the space between the two parts being filled up with powdery iron 3.
  • the outer diameter of the sheath was initially 7.2 mms., the inner diameter 6.2 mms., Whereas the core diameter was 3 nuns.
  • the sheath had an outer diameter of 0.1 mm. and an inner diameter of 0.078 mm.
  • the core had a diameter of 0.050 mm., so that the thickness of the powder layer was 0.014 mm.
  • the powder particles had a size of about 0.03 to 0.05;; and the powder layer had a coercive force of 1100 oersted.
  • a Wire manufactured in this manner may readily be twisted into a knot.
  • a wire-shaped magnetic record carrier comprising an aluminum core, a concentric aluminum sheath spaced from said core and defining an annular space therebetween, and a finely divided permanently magnetizable ferromagnetic material filling said annular space.

Description

J 19, 1956 J. J. WENT ET AL WIRE-SHAPED OBJECT Filed Sept. 24, 1951 INVENTORS Roelof Vermeulen on dwen W RE-SHAPED. OBJECT Jan Jacobus. Went and Roelof Vermeulen, Eindhoven, Netherlands, assignors to Hartford National Bank and Trust; Company, Hartford, Conn., as trustee pp a ion September 24,1951, Serial No. 243,042. Claims priority, application Netherlands. October-,3, 1 950 4. Claims. to]. 29-1912) The invention relates to wire-shaped objects comprising a core and a sheath arranged at a certain distance concentrically thereto, these two parts being preferably made of the same material, the space between the core and the sheath comprising a finely divided powder. It is known to use such an object, in which the powder is made of electrically insulating material, for example as a resistance wire in resistors, an indirectly heated cathode in a highvacuum tube, or as wire capacitors. The construction described makes it possible to manufacture wires of a few tenths of millimeters in thickness in a comparatively simple and cheap manner, i. e. by a series of mechanical operations such, for example, as hammering and subsequent drawing or rolling.
According to the invention the powder is made of permanently magnetizable, ferromagnetic material, the mau terial for the core and the sheath is aluminium or a material, for example a weak kind of copper similar to the former as regards deformability in the cold state and mechanical strength. Apart from the advantages inherent in the known method of manufacturing there is the advantage that owing to the construction, the object according to the invention is particularly suitable to be used as a carrier of magnetic records. In the present case the choice of the sheath material from the series of materials suggested before, for example, nickel, molybdenum or aluminium, is based on the recognition of the fact that during the mechanical operations the intermediate heattreatments of the Wire as are required with other sheath materials such as nickel or molybdenum should not detract from the magnetic properties of the powder. Since aluminium is deformable in cold condition to the degree required for the present case, without becoming brittle and without being cracked or broken, it is well suited for use as sheath material for carriers of magnetic records according to the invention. The use of a weak kind of copper may require an intermediate heat-treatment; in this case the temperature should not exceed 150 C. in order to avoid sintering of the powder and hence a diminution of the magnetic properties. In order to obtain the same advantages for the core and to avoid diificulties in the drawing operation, the core is made of the same material as used for the sheath.
With the object according to the invention and in contradistinction to the known strip-like carriers of magnetic records in which ferromagnetic powder is provided on or in the carrier, the ferromagnetic powder layer to be used for recording or to be provided with records is protected by a sheath. The provision of the sheath has a further advantage in that a binder is not required, so that the filling factor of the space between the core and the sheath may be very high. Since wire-shaped carriers of magnetic records are known to be wound on a reel, the known wire-shaped carriers, in which the ferromagnetic material forms the sheath, bring about the risk of cross-talk owing to the relative contact between adjacent turns. With the wire-shaped carriers according to the invention this disadvantage is sharply reduced, since the magnetic layers nited States PatentQ f adjac n rns a s parat d. by l y o non-m gnetic he th. mate ial.
If it is desired to. manufacture wire-shaped objects a cord ng t he invention wi h th QOnventiQIlfl diam te of wire-shaped carriers of magnetic records lying bet "een 0.2 and 0.05 mm. and with a magnetic powder havlng a coercive force of at least 300 oersted, the powder according to h i ention h s Par i e mag itude not more than 2 the thickness of the layer being about one en h of h ter wire ame r- Th ch i e m n mum value of the coercive force is connected with the well-known fact that at high frequencies the recording sensitiveness increases with an increasing value of the coercive force. The choice ofthe thickness of the powder yer is on ected th, h ne d o ha n the g a pos l mogenei y of. the stray fie dof he. record head throughout the thickness of the magnetic layer.
In spite of the strong relative magnetic efiect of the particles of the aforesaid magnitude relative to one another which is due to the high coercive force, it has been found that the construction and the manufacturing method of the wire, in which the powder layer is strongly compressed, permits of obtaining a very homogeneous distribution of the particles. Such a homogeneous distribution of the particles having the aforesaid coercive force has not yet been obtained with other carriers of magnetic sound records, so that one had to be satisfied either with the use of particles having a lower value of coercive force in order to ensure a sufficiently homogeneous distribution, or with a higher noise level due to a less homogeneous distribution with the use of particles having a coercive force of a value as referred to in the present case.
In addition to the advantage of a high coercive force owing to the small particle size, the use of particles smaller than 2 1. in a wire having an outer diameter of between 0.2 and 0.05 mm., in which the layer thickness is onetenth of the outer diameter, has the advantage that a comparatively great plurality of particles may be provided in the layer. An excessively small plurality of particles per unit of length of the Wire would harmfully aifect the noise. It will be obvious that in each case in practice with a particular wire diameter the maximum particle size and the layer thickness have to be adjusted to one another, in accordance with the noise required.
It should be noted that it has been known that the separate particles may have an extremely high coercive force, if iron, iron alloys, nickel, cobalt and so forth or oxides thereof are in a very finely divided condition with a particle size of less than 2,u.. It is known to utilize this particle size with the manufacture of powdery magnets and to mould the powder in the desired shape at a temperature at which sintering does not occur. It is furthermore known to use such powdery materials on or in stripshaped carriers of magnetic records. However, in this case it is found that, as stated above, one has to be satisfied either with a lower value of the coercive force of the particles or with a higher noise level. Carriers according to the invention in which use is made of the said powdery materials, are free from these disadvantages, since owing to the construction of the carrier the particles are strongly compressed in a very homogeneous distribution without the use of a binder.
In order that the invention may be more clearlyunderstood and readily carried into effect, it will now be described more fully with reference to the accompanying drawing, in which one embodiment of the carrier according to the invention is shown.
The drawing shows a core 1 of pure aluminium and a sheath 2 arranged to surround the core concentrically at a certain distance and made of the same material, the space between the two parts being filled up with powdery iron 3. The outer diameter of the sheath was initially 7.2 mms., the inner diameter 6.2 mms., Whereas the core diameter was 3 nuns. Subsequent to the rolling and drawing operations the sheath had an outer diameter of 0.1 mm. and an inner diameter of 0.078 mm. The core had a diameter of 0.050 mm., so that the thickness of the powder layer was 0.014 mm. The powder particles had a size of about 0.03 to 0.05;; and the powder layer had a coercive force of 1100 oersted. A Wire manufactured in this manner may readily be twisted into a knot.
What we claim is:
1. A wire-shaped magnetic record carrier comprising an aluminum core, a concentric aluminum sheath spaced from said core and defining an annular space therebetween, and a finely divided permanently magnetizable ferromagnetic material filling said annular space.
2. A wire-shaped magnetic record carrier as claimed in claim 1 in which the ferromagnetic material is powdered iron having a particle size not exceeding 2pc.
3. A wire-shaped magnetic record carrier as claimed in claim 2 in which the ferromagnetic material has a coercive force of at least 300 oersted.
References Cited in the file of this patent UNITED STATES PATENTS 978,847 Carlisle Dec. 20, 1910 1,580,647 Breck -Q. Apr. 13, 1926 1,792,377 Jordan Feb. 10, 1931 1,883,559 Chipman Oct. 18, 1932 1,892,607 Bundy Dec. 27, 1932 2,087,051 Stargardter July 13, 1937 2,172,207 Kolligs Sept. 5, 1939 2,290,967 Herriger July 28, 1942 2,459,161 Harris Jan. 18, 1949 2,509,117 Wallace May 23, 1950 2,619,454 Zapponi Nov. 25, 1952
US248042A 1950-10-03 1951-09-24 Wire-shaped object Expired - Lifetime US2750658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2750658X 1950-10-03

Publications (1)

Publication Number Publication Date
US2750658A true US2750658A (en) 1956-06-19

Family

ID=19875563

Family Applications (1)

Application Number Title Priority Date Filing Date
US248042A Expired - Lifetime US2750658A (en) 1950-10-03 1951-09-24 Wire-shaped object

Country Status (1)

Country Link
US (1) US2750658A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057048A (en) * 1958-11-06 1962-10-09 Horizons Inc Protection of niobium
US3271849A (en) * 1962-11-26 1966-09-13 Int Nickel Co Iridium-sheathed wire for electron tubes
US3441494A (en) * 1963-05-25 1969-04-29 Kokusai Denshin Denwa Co Ltd Apparatus to deposit a ferromagnetic film on a conductive wire
US3634190A (en) * 1961-06-27 1972-01-11 Westinghouse Electric Corp Annular composite members and processes for producing the same
US3921700A (en) * 1974-07-15 1975-11-25 Caterpillar Tractor Co Composite metal article containing additive agents and method of adding same to molten metal
US4224085A (en) * 1978-07-21 1980-09-23 The International Nickel Co., Inc. Wire forming process
WO1986003716A1 (en) * 1984-12-20 1986-07-03 Alloy Rods Corporation Cored wire filler metals and a method for their manufacture
US4699762A (en) * 1981-12-30 1987-10-13 Danfoss A/S Method for connecting reaction-sintered silicon carbide parts with iron- or metal parts, and embodiment of an ionization electrode according to the method
US6246008B1 (en) * 1995-06-28 2001-06-12 Castolin, S.A. Process for producing a core wire for welding electrodes and an electrode core wire

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978847A (en) * 1910-03-16 1910-12-20 Improved Seamless Wire Company Wire for ornamental chains.
US1580647A (en) * 1921-02-25 1926-04-13 George D Breck Process for treating ferrous metal to prevent corrosion
US1792377A (en) * 1926-04-15 1931-02-10 Jordan Franz Process for rolling out sheet and hoop or band iron
US1883559A (en) * 1928-11-05 1932-10-18 Andrew Le Roy Chipman Sound film and method of making same
US1892607A (en) * 1930-10-27 1932-12-27 Bundy Tubing Co Method for making a tube
US2087051A (en) * 1933-12-21 1937-07-13 Gillette Safety Razor Co Fine edge blade and method of making the same
US2172207A (en) * 1936-09-19 1939-09-05 Siemens Ag Glow cathode
US2290967A (en) * 1939-03-23 1942-07-28 Lorenz C Ag Electron tube
US2459161A (en) * 1945-01-13 1949-01-18 American Steel & Wire Co Metal coating
US2509117A (en) * 1946-07-24 1950-05-23 Us Rubber Co Method of making composite wire
US2619454A (en) * 1945-08-30 1952-11-25 Brush Dev Co Method of manufacturing a magnetic recording medium by electrodeposition

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978847A (en) * 1910-03-16 1910-12-20 Improved Seamless Wire Company Wire for ornamental chains.
US1580647A (en) * 1921-02-25 1926-04-13 George D Breck Process for treating ferrous metal to prevent corrosion
US1792377A (en) * 1926-04-15 1931-02-10 Jordan Franz Process for rolling out sheet and hoop or band iron
US1883559A (en) * 1928-11-05 1932-10-18 Andrew Le Roy Chipman Sound film and method of making same
US1892607A (en) * 1930-10-27 1932-12-27 Bundy Tubing Co Method for making a tube
US2087051A (en) * 1933-12-21 1937-07-13 Gillette Safety Razor Co Fine edge blade and method of making the same
US2172207A (en) * 1936-09-19 1939-09-05 Siemens Ag Glow cathode
US2290967A (en) * 1939-03-23 1942-07-28 Lorenz C Ag Electron tube
US2459161A (en) * 1945-01-13 1949-01-18 American Steel & Wire Co Metal coating
US2619454A (en) * 1945-08-30 1952-11-25 Brush Dev Co Method of manufacturing a magnetic recording medium by electrodeposition
US2509117A (en) * 1946-07-24 1950-05-23 Us Rubber Co Method of making composite wire

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057048A (en) * 1958-11-06 1962-10-09 Horizons Inc Protection of niobium
US3634190A (en) * 1961-06-27 1972-01-11 Westinghouse Electric Corp Annular composite members and processes for producing the same
US3271849A (en) * 1962-11-26 1966-09-13 Int Nickel Co Iridium-sheathed wire for electron tubes
US3441494A (en) * 1963-05-25 1969-04-29 Kokusai Denshin Denwa Co Ltd Apparatus to deposit a ferromagnetic film on a conductive wire
US3921700A (en) * 1974-07-15 1975-11-25 Caterpillar Tractor Co Composite metal article containing additive agents and method of adding same to molten metal
US4224085A (en) * 1978-07-21 1980-09-23 The International Nickel Co., Inc. Wire forming process
US4699762A (en) * 1981-12-30 1987-10-13 Danfoss A/S Method for connecting reaction-sintered silicon carbide parts with iron- or metal parts, and embodiment of an ionization electrode according to the method
WO1986003716A1 (en) * 1984-12-20 1986-07-03 Alloy Rods Corporation Cored wire filler metals and a method for their manufacture
US6246008B1 (en) * 1995-06-28 2001-06-12 Castolin, S.A. Process for producing a core wire for welding electrodes and an electrode core wire

Similar Documents

Publication Publication Date Title
US2750658A (en) Wire-shaped object
US2283925A (en) High frequency core and shield and method of making the same
US2998840A (en) Laminated strip product for electrical purposes
US2290680A (en) Electromagnetic coil
US4383225A (en) Cables with high immunity to electro-magnetic pulses (EMP)
US2973490A (en) Electrical wave filter apparatus
US2749423A (en) Device for high-frequency heating
US2280980A (en) Electron discharge device
US2827437A (en) Method of making a permanent magnet
US2727945A (en) High frequency magnetic elements and telecommunication circuits
US4227166A (en) Reactor
US3839655A (en) Bayard-alpert vacuum ionization tube
US1940228A (en) Radio-amplifying circuits
US2330590A (en) Dust iron core
US2339137A (en) High frequency core material and core and process for making said material
US1651958A (en) Insulation of finely-divided magnetic material
US2860105A (en) Method of manufacturing ferromagnetic cores
US3665351A (en) Superconductive magnets
GB514170A (en) Improvements in the magnetic deflection of the ray in cathode ray tubes
GB1322092A (en) Method of adjusting the dimensions of sintered ferromagnetic cores
US2888618A (en) Dry plate rectifier assemblies
US3253193A (en) Superconducting means for concentrating magnetic flux
US2499789A (en) Method of manufacturing magnetic mass cores
GB691659A (en) Improvements in or relating to wire-shaped objects comprising a core and a sheath with magnetic powder in between
US3315196A (en) Pot type magnetic core for toroidal coil