US1826955A - Electric current rectifier - Google Patents

Electric current rectifier Download PDF

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US1826955A
US1826955A US179478A US17947827A US1826955A US 1826955 A US1826955 A US 1826955A US 179478 A US179478 A US 179478A US 17947827 A US17947827 A US 17947827A US 1826955 A US1826955 A US 1826955A
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contact
couple
electropositive
cup
electrode element
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Ruben Samuel
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RUBEN RECTIFIER Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/06—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising selenium or tellurium in uncombined form other than as impurities in semiconductor bodies of other materials
    • H01L21/10—Preliminary treatment of the selenium or tellurium, its application to the foundation plate, or the subsequent treatment of the combination
    • H01L21/108—Provision of discrete insulating layers, i.e. non-genetic barrier layers

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  • This invention relates to electric current rectifiers and the like, which employ asymmetric couples of the dry surface-contact variet Rictifiers of this variety are known, which are characterized by the use of a body of relatively electropos'itive material, employed as one electrode element, disposed in electrical contact with a body of relatively electronegative material employed as the other electrode element; there being an intervening film having inverse current-blocking properties.
  • Such rectifiers depend for their eration upon the resistance and currentlocking characteristics of the film which forms as the result of electrochemical action. Rectifiers depending on these characteristics known to the priorart, have been low in elliciency and limited in their application to small currents, because of improper conditions for film-formation and maintenance, and become substantially inoperative after short periods of use.
  • the invention has for its object generally to provide an improved device of the character specified, which is eflicient, economical and readily manufactured,and has a relatively long operating life for high current-densities.
  • the electronegative electrode material here employed is preferably in powder form and selected to Withstand the effects of electrolytic action.
  • a more specific object of the invention is to provide an asymmetric couple in which the electronegative electrode element has relatively high density and is also relatively conformable to the co-operating surface of the electropositive electrode element, so that there is substantially a maximum area at all times at the contacting surfaces of the electrode elements.
  • FIG. 1 shows diagrammatically a rectifying device constructed in accordance with the invention
  • Fig. 2 is a cross-sectional view showin th arrangement of the electrode elements ere em loyed
  • ig. 3 is an elevational view showing the form of the plate members employed in the asymmetric couple shown in Fig. 2;
  • Fig. 4 is an elevational view showing a single asymmetric couple of the present invention mounted upon standards.
  • Fig. 2 denotes a cup, or receptacle having upturned sides, which is made of suitable conducting material; for example, copper, brass or steel, in which is disposed a layer of material 11, here employed as the electronegative electrode element.
  • suitable conducting material for example, copper, brass or steel, in which is disposed a layer of material 11, here employed as the electronegative electrode element.
  • An electropositive electrode element is shown as a plate member, or disc 12, of suitable material disposed in co-operative contact above the layer of material 11.
  • a third disc 14 designed as a closure for the cup 10 and is preferably of the same material as the cup 10.
  • the discs and cup 10 are perforated and have an insulating tube 15 passed therethrough.
  • an insulating collar .16 is inserted between the upstanding rim of to build up a rectifying device of any convenient character; for example, as a four-couple device as shown in Fi". l, or as a single-couple device, as shown in big. 4.
  • a couple a is shown as disposed between conducting end-plates 17, formed to serve as standards.
  • two groups comprising two couples each, the coupies being disposed between conducting endplates 17 are inverted with respect to each other, and disposed in conducting relation with the central terminal-plate 18.
  • the clamping-bolt 19 extends through the assembled couples and has spring-washers 20 inserted between the terminal-plates 17 and the head-ends of the bolt.
  • the four couples here employed comprise the arms of a Wheatstone bridge, of which the terminals provided at 18 and 21 comprise one diagonal of the bridge circuit, and are adapted to serve as terminals for the output circuit of the rectifying device, here shown as conductors 22 and 23, leading to the terminals of a direct-current consuming device, here symbolically indicated by the signs and
  • the terminal-plates 17" disposed intermediately of the inverted groups are the terminals of the other diagonal of the bridge clrcuit and serve as terminals for the alternating-current input circuit, here shown as the conductors 24 and 25, leading from the low tension side of a suitable step-down transformer 26, which is here shown as connected to an original source 27 of alternatingcurrent; for example, a commercial GO-cycle, 110-volt, AC-supply.
  • the electronegative electrode element in the cup 10 adjacent to the terminal-plate 17 to which the conductor 24 leads will be positively charged and a direct current will pass, as a result of rectification, to the plate 18, and thence by way of the conductor 22 to the plus terminal of the direct-current consuming device, and from thence by way of conductor 23 and a second electronegative electrode element adjacent to the terminal 21 to the conductor 25; and vice versa when the conductor 25 has a plus polarity.
  • the electropositive electrode element here employed is a metallic body in solid form of substantially any relative stable but highly chemically active electropositive element, for example, aluminum, boron, calcium, magnesium or zinc, such as taught in my co-pending application Serial No. 69,215, filed November 16, 1925.
  • the electronegative electrode element is a body preferably in powdered form, of a relatively highlv electronegative chemical element in a relatively pure state. In the ar rangement shown at 11, in Fig. 2, a body of powder which is relatively highly compressed, is disposed in the bottom of the cup 10.
  • the chemical elements adapted to be components of the electronegative electrode elements are preferably the elements of the sixth group of chemical elements in the periodic table, which have relatively high electrical conductivities and are adapted also to react strongly in forming an inverse current-blocking film at the contacting surface between the electropositive and electronegative elements. Suitable chemical elements have been ascertained to be selenium and tellurium.
  • a resistance layer is provided at the contacting surface between the electropositive and electronegative electrode elements.
  • Such layer may be a thin coating of an oxide 12 disposed over the contacting surface of the disc 12 and is placed in contact with the electronegative element 11.
  • the disc is of magnesium and the electronegative electrode element is powdered tellurium having an effective contacting surface of substantially one square inch, a uniform layer of .0001 of an inch in thickness of ma gnesium oxide on the magnesium disc is sufficient for the practice of the present invention.
  • the pressure to be applied to the couple should be suiiicent to prevent the inverse current-blocking film for being .disrupted by electrostatic repulsive forces operating at the contacting surfaces.
  • the electronegative electrode element is in powder form, it is adapted to adjust itself for intimate contact with the electropositive electrode element under substantially all conditions of operation and is. therefore. adapted for operation at substantially maximum current densities. It has been ascertained that in asymmetric couples of this character in which the contacting surface has been electrolytically oxidized to provide a relatively rigid contacting resistance layer, a couple is produced capable of resisting the effects of the composition by electrolysis, and in consequence has a high stability characteristic and is adapted for service under severe operating devices over relatively long periods of time.
  • an electronegative electrode element of the character here employed can still be made use of by casting the same into a solid disc and assembling the rectifier, as taught in my copendin application Serial No. 750,939, filed Novem er18, 1924.
  • an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a relative stable highly chemically active electropositive metal formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface, and means for maintaining said cou ple assembled under pressure sufficient for a relatively permanent rectifying effect.
  • an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a relatively stable highly chemically active electropositive metal formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface, means in contact with said electropositive electrode element for absorbing the energy of vibration in said couple, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying effect.
  • an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a solid body of metallic magnesium formed to have a resistance layer of magnesium oxide uniformly disposed over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse currentblocking film at the contacting surface, means in contact with said electropositive electrode element for absorbing the energy of vibration in said couple, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent-rectifying effect.
  • an asymmetric couple having an electronegative electrode element of metallic tellurium in powder form, a conducttively stable highly chemically active electropositive metal disposed in said cup in contact with said powder element and formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contact surface, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying effect.
  • lic tellurium in powder form a conducting cup adapted to support the same; an electropositive electrode e ement of a solid body of metallic magnesium formed to have a resistance layer of magnesium oxide uniformly dispos'ed over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface;-a second plate of soft metal disposed in said cup upon said electropositive electrode plate; a third plate of conducting material similar to said cup, disposed upon said second plate and arranged to serve as a closure for said cup, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying efl'ect.
  • Patent No. 1,826, 955

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
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Description

Oct. 13, 1931. 5, RUBEN 1,826,955
ELECTRIC CURRENT RECTIFIER Filed March 30. 1927 IN V EN TOR.
Y ga 4- 4L! M 5 A TTORNEYS.
Patented Oct. 13, 1931 UNITED STATES PATENT OFFQCE SAMUEL BUIBEN, OF NEW YORK, N. Y., ASSIGNOR TO RUBEN RECZLIFIEB CORPORATION, OF ENGLEWOOD, NEW JERSEY, A CORPORATION OF DELAWARE ELECTRIC CURRENT RECTIFIER Application filed March 30, 1927. Serial No. 179,478.
This invention relates to electric current rectifiers and the like, which employ asymmetric couples of the dry surface-contact variet Rictifiers of this variety are known, which are characterized by the use of a body of relatively electropos'itive material, employed as one electrode element, disposed in electrical contact with a body of relatively electronegative material employed as the other electrode element; there being an intervening film having inverse current-blocking properties. Such rectifiers depend for their eration upon the resistance and currentlocking characteristics of the film which forms as the result of electrochemical action. Rectifiers depending on these characteristics known to the priorart, have been low in elliciency and limited in their application to small currents, because of improper conditions for film-formation and maintenance, and become substantially inoperative after short periods of use.
The invention has for its object generally to provide an improved device of the character specified, which is eflicient, economical and readily manufactured,and has a relatively long operating life for high current-densities. To this end the electronegative electrode material here employed is preferably in powder form and selected to Withstand the effects of electrolytic action.
A more specific object of the invention is to provide an asymmetric couple in which the electronegative electrode element has relatively high density and is also relatively conformable to the co-operating surface of the electropositive electrode element, so that there is substantially a maximum area at all times at the contacting surfaces of the electrode elements.
Other objects of the invention will in part be obvious and will in part appear hereinafter.
The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts, which will be exemplified in the constructions hereinafter set forth and the scope of the application of which will be indicated in the claims.
For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:
Figure 1 shows diagrammatically a rectifying device constructed in accordance with the invention;
Fig. 2 is a cross-sectional view showin th arrangement of the electrode elements ere em loyed;
ig. 3 is an elevational view showing the form of the plate members employed in the asymmetric couple shown in Fig. 2; and
Fig. 4 is an elevational view showing a single asymmetric couple of the present invention mounted upon standards.
Referring now to the drawings and particularly to Fig. 2, 10 denotes a cup, or receptacle having upturned sides, which is made of suitable conducting material; for example, copper, brass or steel, in which is disposed a layer of material 11, here employed as the electronegative electrode element.
An electropositive electrode element is shown as a plate member, or disc 12, of suitable material disposed in co-operative contact above the layer of material 11. A second disc 13, adapted to serve as a backing, is disposed on the disc 12 and is here shown by double hatching. Any soft metal which will absorb vibration and compensate for excessive expansion-contraction of the elements, may be chosen as the component material for disc 13, for example, lead. Above the disc 13 is a third disc 14 designed as a closure for the cup 10 and is preferably of the same material as the cup 10.
When the asymmetric couples of the present invention are to be assembled by means of a bolt, the discs and cup 10 are perforated and have an insulating tube 15 passed therethrough. In order also that the electrical relation of the elements of the couple be not disturbed at the outer edge, an insulating collar .16 is inserted between the upstanding rim of to build up a rectifying device of any convenient character; for example, as a four-couple device as shown in Fi". l, or as a single-couple device, as shown in big. 4. In the latter a couple a is shown as disposed between conducting end-plates 17, formed to serve as standards.
In the device, illustrated in Fig. 1, two groups comprising two couples each, the coupies being disposed between conducting endplates 17 are inverted with respect to each other, and disposed in conducting relation with the central terminal-plate 18. The clamping-bolt 19 extends through the assembled couples and has spring-washers 20 inserted between the terminal-plates 17 and the head-ends of the bolt. By the arrangement shown, it s seen that the four couples here employed comprise the arms of a Wheatstone bridge, of which the terminals provided at 18 and 21 comprise one diagonal of the bridge circuit, and are adapted to serve as terminals for the output circuit of the rectifying device, here shown as conductors 22 and 23, leading to the terminals of a direct-current consuming device, here symbolically indicated by the signs and The terminal-plates 17" disposed intermediately of the inverted groups are the terminals of the other diagonal of the bridge clrcuit and serve as terminals for the alternating-current input circuit, here shown as the conductors 24 and 25, leading from the low tension side of a suitable step-down transformer 26, which is here shown as connected to an original source 27 of alternatingcurrent; for example, a commercial GO-cycle, 110-volt, AC-supply.
By the arrangement shown, when the conductor 24 has a plus polarity, the electronegative electrode element in the cup 10 adjacent to the terminal-plate 17 to which the conductor 24 leads, will be positively charged and a direct current will pass, as a result of rectification, to the plate 18, and thence by way of the conductor 22 to the plus terminal of the direct-current consuming device, and from thence by way of conductor 23 and a second electronegative electrode element adjacent to the terminal 21 to the conductor 25; and vice versa when the conductor 25 has a plus polarity.
The electropositive electrode element here employed is a metallic body in solid form of substantially any relative stable but highly chemically active electropositive element, for example, aluminum, boron, calcium, magnesium or zinc, such as taught in my co-pending application Serial No. 69,215, filed November 16, 1925.
' The electronegative electrode element is a body preferably in powdered form, of a relatively highlv electronegative chemical element in a relatively pure state. In the ar rangement shown at 11, in Fig. 2, a body of powder which is relatively highly compressed, is disposed in the bottom of the cup 10. The chemical elements adapted to be components of the electronegative electrode elements are preferably the elements of the sixth group of chemical elements in the periodic table, which have relatively high electrical conductivities and are adapted also to react strongly in forming an inverse current-blocking film at the contacting surface between the electropositive and electronegative elements. Suitable chemical elements have been ascertained to be selenium and tellurium.
In order that there may be a sufficient ener gy for the reaction of electrochemically forming and maintaining the inverse currentblocking film supplied out of the resistance losses incident to the passage of rectifying current through the asymmetric couple, as set forth in my co-pending applications Serial No. 38,781, filed June 20, 1925, and Serial No. 113,009, filed June 1, 1926, a resistance layer is provided at the contacting surface between the electropositive and electronegative electrode elements. Such layer may be a thin coating of an oxide 12 disposed over the contacting surface of the disc 12 and is placed in contact with the electronegative element 11. Where the disc is of magnesium and the electronegative electrode element is powdered tellurium having an effective contacting surface of substantially one square inch, a uniform layer of .0001 of an inch in thickness of ma gnesium oxide on the magnesium disc is sufficient for the practice of the present invention. The pressure to be applied to the couple, as set forth in my application Serial No. 38,781, should be suiiicent to prevent the inverse current-blocking film for being .disrupted by electrostatic repulsive forces operating at the contacting surfaces.
Where the electronegative electrode element is in powder form, it is adapted to adjust itself for intimate contact with the electropositive electrode element under substantially all conditions of operation and is. therefore. adapted for operation at substantially maximum current densities. It has been ascertained that in asymmetric couples of this character in which the contacting surface has been electrolytically oxidized to provide a relatively rigid contacting resistance layer, a couple is produced capable of resisting the effects of the composition by electrolysis, and in consequence has a high stability characteristic and is adapted for service under severe operating devices over relatively long periods of time.
In a service, however. where compactness is more important than high current density, an electronegative electrode element of the character here employed can still be made use of by casting the same into a solid disc and assembling the rectifier, as taught in my copendin application Serial No. 750,939, filed Novem er18, 1924.
Since certain changes may be made in the above construction and different embodiments of the invention could be made without departin from the scope thereof, it is intended that a l matter contained in the'above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.
Having described my invention, what I claim as new and desire to secure by Letters Patent, is:
1. In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a relative stable highly chemically active electropositive metal formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface, and means for maintaining said cou ple assembled under pressure sufficient for a relatively permanent rectifying effect.
2. In dry surface-contact rectifying de vices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a relatively stable highly chemically active electropositive metal formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface, means in contact with said electropositive electrode element for absorbing the energy of vibration in said couple, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying effect.
In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a solid body of metallic magnesium formed to have a resistance layer over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface, and means for maintaining said couple assembled under pressure sufficient for a re I tively permanent rectifying effect.
4. In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium, and an electropositive electrode element of a solid body of metallic magnesium formed to have a resistance layer of magnesium oxide uniformly disposed over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse currentblocking film at the contacting surface, means in contact with said electropositive electrode element for absorbing the energy of vibration in said couple, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent-rectifying effect.
5. In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium in powder form, a conducttively stable highly chemically active electropositive metal disposed in said cup in contact with said powder element and formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contact surface, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying effect.
6. In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium in powder form, a conducting cup adapted to support the same, an c'lectropositive electrode in plate form of a relatively stable highly chemically active electropositive metal disposed in said cup in contact with said powder element and formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse currenthlocking film at the contacting surface; a second plate of soft metal disposed in said cup upon said electropositive electrode plate, and means for maintainin said couple assembled under pressure su cient for a relatively permanent rectifying effect.
7. In dry surface-contact rectifying devices and the like, an asymmetric couple having an electronegative electrode element of metallic tellurium in powder form; a conducting cup adapted to support the same, an electropositive electrode in plate form of a relatively stable highly chemically active electropositive metal disposed in said cup in contact with said powder element and formed to have a contact resistance adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface; a second plate of soft metal disposed in said cup upon said electropositive electrode plate; a third plate of conducting material similar to said cup disposed upon said second plate and arranged to serve as a closure for said cup, and means for maintaining said couple assembled under pressure sufficient for a relatively licrmanent rectifying effect.
8. In dry surfacecontact rectifying devices and the like. an asymmetric couple having an clcctroncgutive electrode element of metallie tellurium in powder form; a conducting cup adapted to support the same; an electropositive electrode element of a solid body of metallic magnesium formed to have a resistance layer of magnesium oxide uniformly dispos'ed over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface;-a second plate of soft metal disposed in said cup upon said electropositive electrode plate; a third plate of conducting material similar to said cup, disposed upon said second plate and arranged to serve as a closure for said cup, and means for maintaining said couple assembled under pressure sufticient for a relatively permanent rectifying efi'ect.
9. A dry surface-contact rectifying device including an anode of tellurium and a cathode of a relatively highly electropositive metal.
10. A dry surface-contact rectifying device including an anode of tellurium and a cathode of magnesium.
11. A dry surface-contact rectifyin device comprising an anode of tellurium an a cathode of a relatively highly electropositive metal and an oxide layer therebetween.
12. A dry surface-contact rectifying device comprising an anode of tellurium and a cathode of magnesium and an oxide layer therebetween.
In testimony whereof I aflix my si nature.
SAMUEL RU EN.
lic tellurium in powder form; a conducting cup adapted to support the same; an electropositive electrode e ement of a solid body of metallic magnesium formed to have a resistance layer of magnesium oxide uniformly dispos'ed over its contacting surface adapted to supply the energy from resistance losses for the formation and maintenance of an inverse current-blocking film at the contacting surface;-a second plate of soft metal disposed in said cup upon said electropositive electrode plate; a third plate of conducting material similar to said cup, disposed upon said second plate and arranged to serve as a closure for said cup, and means for maintaining said couple assembled under pressure sufficient for a relatively permanent rectifying efl'ect.
9. A dry surface-contact rectifying device including an anode of tellurium and a cathode of a relatively highly electropositive metal.
10. A dry surface-contact rectifying device including an anode of tellurium and a cathode of magnesium.
11. A dry surface-contact rectifying device comprising an anode of tellurium and a cathode of a relatively highly electropositive metal and an oxide layer therebetween.
12. A dry surface-contact rectifying device comprising an anode of tellurium and a cathode of magnesium and an oxide layer therebetween.
In testimony whereof I aflix my signature.
SAMUEL RUBEN.
CERTIFICATE OF CORRECTION.
Patent No. 1,826, 955.
SAMUEL RUBEN.
Granted October 13, 1931, to
It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 105, for "for" read from; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case .in the Patent Office.
Signed and sealed this 9th day of February, A. D. 1932.
M. J. Moore,
(Seal) Acting Commissioner of Patents.
CERTIFICATE OF CORRECTION.
Patent No. 1,826,955. Granted October 13, 1931, to
SAMUEL RUBEN.
It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 105, for "for" read from; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case ,in the Patent Office.
Signed and sealed this 9th day of February, A. D. 1932.
M. J. Moore, (Seal) Acting Commissioner of Patents.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446468A (en) * 1945-06-14 1948-08-03 Fansteel Metallurgical Corp Selenium rectifiers
US2452577A (en) * 1943-10-07 1948-11-02 Standard Telephones Cables Ltd Dry rectifier element and method of manufacture
US2462906A (en) * 1943-05-01 1949-03-01 Standard Telephones Cables Ltd Manufacture of metal contact rectifiers
US2483673A (en) * 1946-10-02 1949-10-04 Jordan Electrical Mfg Company Battery charger
US2495716A (en) * 1943-10-13 1950-01-31 Int Standard Electric Corp Rectifier
US2524270A (en) * 1945-09-27 1950-10-03 Sylvania Electric Prod Selenium rectifier
US2575388A (en) * 1947-01-06 1951-11-20 Vickers Inc Electrical rectifiers
US2685728A (en) * 1949-02-21 1954-08-10 Bell Telephone Labor Inc Translating material and method of manufacture
US2869057A (en) * 1951-12-18 1959-01-13 Itt Electric current rectifier
US2887627A (en) * 1953-01-09 1959-05-19 John W Haas Rectifier and method of making the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462906A (en) * 1943-05-01 1949-03-01 Standard Telephones Cables Ltd Manufacture of metal contact rectifiers
US2452577A (en) * 1943-10-07 1948-11-02 Standard Telephones Cables Ltd Dry rectifier element and method of manufacture
US2495716A (en) * 1943-10-13 1950-01-31 Int Standard Electric Corp Rectifier
US2446468A (en) * 1945-06-14 1948-08-03 Fansteel Metallurgical Corp Selenium rectifiers
US2524270A (en) * 1945-09-27 1950-10-03 Sylvania Electric Prod Selenium rectifier
US2483673A (en) * 1946-10-02 1949-10-04 Jordan Electrical Mfg Company Battery charger
US2575388A (en) * 1947-01-06 1951-11-20 Vickers Inc Electrical rectifiers
US2685728A (en) * 1949-02-21 1954-08-10 Bell Telephone Labor Inc Translating material and method of manufacture
US2869057A (en) * 1951-12-18 1959-01-13 Itt Electric current rectifier
US2887627A (en) * 1953-01-09 1959-05-19 John W Haas Rectifier and method of making the same

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