CA1188762A - Combined capacitor and resistor - Google Patents
Combined capacitor and resistorInfo
- Publication number
- CA1188762A CA1188762A CA000421438A CA421438A CA1188762A CA 1188762 A CA1188762 A CA 1188762A CA 000421438 A CA000421438 A CA 000421438A CA 421438 A CA421438 A CA 421438A CA 1188762 A CA1188762 A CA 1188762A
- Authority
- CA
- Canada
- Prior art keywords
- roll
- resistor
- capacitor
- metallized
- dielectric
- 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
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Abstract
COMBINED CAPACITOR AND RESISTOR
ABSTRACT OF THE DISCLOSURE
In a metallized capacitor roll with margin electrodes offset at each roll end, a resistor is placed axially in the roll so that one end contacts an electrode across a margin and the other end protrudes from the roll end to be contacted by the schooping metal at the roll end.
ABSTRACT OF THE DISCLOSURE
In a metallized capacitor roll with margin electrodes offset at each roll end, a resistor is placed axially in the roll so that one end contacts an electrode across a margin and the other end protrudes from the roll end to be contacted by the schooping metal at the roll end.
Description
76~
COMBINED CAPACITOR AND RESISTOR
This invention relates to a combined electrical capacitor and resistor and more particularly to a metallized synthetic resin capacitor roll where a resistor is incorporated in the roll winding inter-mediate the roll ends.
~ACKGROUND OF THE INVENTION
Electrical resistors are used in combination with capacitors to reduce the electrical charge on a capacitor after the capacitor is discon~ected from its circuit. Specifications usually require thajt the charge be reduced to a safe value within a predeter-mined period of time. It has been a prior practice to connect a resistor element of a predetermined value between the electrodes of a capacitor~ In a capacitor which is contained in a case and filled with a die-lectric fluid a resistor element may be utilized inside of the can and between the capacitor leads. One example of this combination is disclosed and described in U.S. Paten-t 3,302,081-Grahame, assigned to the same assignee as the present invention.
In a capacitor roll section made up of alternate strips of electrode foil and dielectric material, a resistor element may be made up of a carbon loaded ~876~
paper and inserted into the capacitor roll to contact each foil, at the end of the roll. One example o~ such a resistor is disclosed and claimed in U~S. Patent 3,840,787-Grahame, assigned to the same assignee as the present in-vention.
It is dif~icult to incorporate a resistor in a dry metallized capacitor such as disclosed and described in U.S. Patent 4,037,298-Flanagan, assigned to the same assignee as the present invention. In the ~lanagan patent a capacitor roll section is made up of strips of a synthetic resin dielectric, such as polypropylene, on one side of which a very thin metal layer of aluminum, for example, is vapor deposited. These strips are wound together very tightly in a round roll form and may then lS be used in dry form, i.e., unimpregnated with a dielectric fluid, and perhaps merely encased in a plastic jacket, or, impregnated with a fluid in the usual manner.
Automated manuacture of these capacitors make it uneconomical to connect a separate resistor between the electrode leads of the capacitor, and the difificulties of providing an electrical connection between the resistor and the metallized layers also make the insertion of a carbon loaded paper or other electrode inter-connection means less desirable.
SUMMARY OF T~E INVENTION
It has been discovered that a flexible strip resistor may be incorporated in a dry metallized capac-itor roll by arranging the strip to lie adjacent the finished capacitor roll intermediate the roll ends so that the sprayed metal connection at each end of the roll also connects the considerable length of resistor strip 7~
36-C~-3552 with the capacitor electrodes. The jacket material or several turns of dielectric material around the capacitor roll protects the resistor.
THE D~WINGS
This invention will be better understood when taken in connection with the following description and drawings in which, ~IG. 1 illustrates a preferred form of this invention as a dry metallized capacitox roll ~ection with a discharge resistor incorporated therewith.
FIG. 2 is an exaggerated, sectional, cutaway view of FIG~ l illustrating a discharge resistor connected to the schooped ends of a capacitor.
FIG. 3 is a cutaway view of the embodiment of FIG. 2 illustrating the position of the resistor strip adjacent the circumference of the capacitor roll.
Discussion of Preferred_Embodiments Referring now to FIG~ 1, there is disclosed one preferred embodiment o this invention as a capacitor roll section 10. Roll section 10 comprises a pair of dielectric material strips 11 and 12 which have bee~
metallized as illustrated by metallized surfaces or coatings 13 and 14. As is the usual practicQ, the strlps 11 and 12 are metallized in a manner which leaves metal free marglns 15 and 16 along opposite ed~es of the roll 10. As illustrated in FIG. i, tne roll lO is provided with a hard core 17 which may be of a tubular or solid form and is coextensive through the roll.
'7~
Core 17 is preferably of a haxd non-conductive material such as one of the synthetic resins, for example, polypropylene. In the practice of this invention, core 17 is used as a single use arbor on which to wind hard roll 10 much in the manner described in UOS. Patent 3,153,180-Bellmore, assigned to the same assignee as the present invention. The winding process to wind a hard roll 10 may be carried out on various winding machines, the one shown in U.S. Patent 2,328,520-West, assigned to the same assignee of the present invention being one example.
In the winding process of roll 10, the strips 11 and 1~ are laterally offset with respect to each other in order that each roll edge or end will display an offset with its metallized coatings at the edge of the strip. Therefore, suitable leads may be attached to the roll ends through utilization of the well known schooping process. There is minimal danger of the schooping material penetrating sufficiently into the roll edge to electrically short the other metallized surface ~ecause of the free margin construction.
Referring now to FIG. 2 there is illustrated a preferred application of the resistor of this invention to the capacitor roll section 10 of ~IG 1.
After the roll section of FIG. 1 is wound in roll form on a roll winding machine, a resistor strip element 1 is placed adjacent the roll as ilLustrated in FIG. Z.
Thereafter sevexal turns of an unmetallized dielectris 19 is wound about the roll to retain the resistor 18 in its illustrated position. Dielectric turns 19 are ordinarily used to hold the roll 10 strips in position, to protect the roll from ~ndue abrasion, etc. and more particularly to act as a shrunk on sleeve ror the roll 10.
3'7~
In this latter connection, when the roll 10 i5 heated the sleeve will shrink radially to tightly engage the roll for retained tightness.
As illustrated in FIG. 2, with the roll in its wound form, and resistor element 18 in position, the ends 20 and 21 of the roll section 10 are coated with layers 22 and 23 of an appropriate bonding metal (such as aluminum for example) by means of a schooping process or other appropriate process. In this instance, the schooping metal layers 22 and 23 cover each end of the roll section 10 respectively, and make contact with the resistor element 18, at the same time as they make contact with the leads 24 and 25. This contacting means is best shown with respect to FIG. 2.
Referring now to FIG. 3, the capacltor roll 10 is shown in a partial and cross-sectional view to illustrate the reLationship of the elements. In FIG. 3 the die-lectric strips 11 a~d 12 are offset with respect to each other so that one of the metallized surfaces-jl4 extends at the upper end 26 of roll 10 and the other metallized surface 13 extends at the lower end 21 of roll 10. The resistor element 18 lies adjacent the outer part of the roll 10 and its ends either extend slightly past one end of the roll 10, as shown at the uppe~ end 20 of roll 10, or is generally flush with the roll 10 as shown at the bottom end 21. Thereafter, one or more turns 19 of a suitable dielectric strip are wound a~out roll 10 to serve as a means of protectlon to the resistor element 18 and to serve as a protective wrapper or casing for the roll.
6~
After assembly as illustrated in FIG. 3, the roll ends 20 and 21 are subjected to a schooping operation whereby a molten metal such as aluminum or zinc is spray-coated over the ends of 20 and 21 of the S roll to form the conducting metal layers 22 and 23. The conducting metal 22 and 23 contact the exposed metallized layers 13 and 14 of the capacitor roll 10, and while so doing, also contact the ends of the resistor element strip 18~ The resistor ends (or the leads of a resistor) may be positioned at the very end OL the roll 10 as to slightly overlap the ends. They may also be slightly shorter than the roll depending on the precise bounds of the schooped metal layer. A p~ir of leads 24 and 25 for the electrodes of the capacitor are joined to the schooped layers 22 and 23. By this means separate joining soldering or welding operations or other resistox locations are eliminated. The preferred ~esistor concept of this invention i~ applicable only to tho~e capacitors which have metallized dielectrics and schooped ends.
The resistor el~ment 18 of this invention may ta.~e the form of man~ well known types of flexible or thin strip resistors, so long as they lie closely adjacent the capacitor roll sec~ion with minimum projection, and whose ends may be easily schooped by the same process used to schoop the ends of the capacitor. In a preferred form of this invention the resistor 18 is a paper strip in T,ihich a carbon material has been incorporated to pro~Jide a predetermined resistance per unit of length of s~rip.
Whlle resistor 18 may be positioned elseT~he~e in the roll it is preferred to uti~ize lt at the outer extremity of the roll where capacitor operating temp-36 C~-3552 erature effects of the roll are minimized and where the resistor 18 is not in the electrical field~ It is not desirable to position the resistor la in the interior portion of the capacitor roll for capacitors rated above about 250 volts AC because these capacitors must be wound extremely tightly with close tolerances in order to eliminate all gaps and spaces, and the presence of a resistor strip between the roll windings could cause problems.
In one practice of this invention capacitor rolls were made up in accordance with the structure shown in FIG. 3. The capacitor was rated at 240 VAC
and was about 1.5 inches in length and 0.7S inch in diameter. Alternate resistors 18 used carbon loaded paper strips of 0.5 inch width and about 1.5 and 0.1 inches length. The resistor strip was placed flush with the roll and held in plaze by several turns of unmetall-ized polypropylene. The resistor element was abcut as long (or wide) as the roll and the resistor énds were exposed at each end of the roll. 30th ends of the roll were schooped and the metal spray from this operation joined the capacitor electrodes and the resistor ends in one operation. The practice of this invention may be applied to capacitors other than roll capacitors such as flat or stacked capacitors which are also metallized and which use schooped ends to join the electrodes. The cross-section of a flat or stacked capacitor reveals the same array of superimposed contiguous layers of dle-lectric and metallized layers. In a flat capacitor, one dimension, such as a width, is a predetermined dimension, and the resistor element or its leads is at least of the same dimension so ~hat in the assembled 3t~
~6-CA-3552 relationship each of the resistor ends or leads are ex posed at a respective end of the capacitor for the schoop-ing material. The resistor strip lies flush wlth the flat stack. It is important in this invention that any capa-5 citor section be a metallized section and the resistor tobe quite flat to fit flush with the capaci~or section so that the schooping operation provides a simultaneous electrode and resistor connection.
The practice of this invention is applicable to various metallized capacitors regardless o the dielectric material, e.g. metallized paper, metallized polypropylene and other metallized materials. It is the simultaneous joining of the resistor ends by the metal spray or schoop-ing process which is more important. In this connection the resistor element 18 may take various alternate shapes and modifications. For example, an electrically conduct-ing liquid or ink may be deposited on the exterior of the capacitor roll 10, for exampLe, by printing, depositing or ~praying, and the~ dried or solidified to form resistor 18 of an appropriate shape and resistance. The ~esistor may also be a suitable wrap material of for example, an eLectrically conducting synthetic resin or paper material and wrapped about roll 10 in the same manner and posltion as wrap 19, although a further non-conducting wrap may then be desirable.
While this invention has been disclosed with respect to particular embodiments thereof, numerous modifications may be made by those skilled in the art without departing from its true spirit and scope.
Therefore, it is intended that the appended claims cover all such modlfications and variations which come ~ithin the true spirit and scope of the present inventionO
COMBINED CAPACITOR AND RESISTOR
This invention relates to a combined electrical capacitor and resistor and more particularly to a metallized synthetic resin capacitor roll where a resistor is incorporated in the roll winding inter-mediate the roll ends.
~ACKGROUND OF THE INVENTION
Electrical resistors are used in combination with capacitors to reduce the electrical charge on a capacitor after the capacitor is discon~ected from its circuit. Specifications usually require thajt the charge be reduced to a safe value within a predeter-mined period of time. It has been a prior practice to connect a resistor element of a predetermined value between the electrodes of a capacitor~ In a capacitor which is contained in a case and filled with a die-lectric fluid a resistor element may be utilized inside of the can and between the capacitor leads. One example of this combination is disclosed and described in U.S. Paten-t 3,302,081-Grahame, assigned to the same assignee as the present invention.
In a capacitor roll section made up of alternate strips of electrode foil and dielectric material, a resistor element may be made up of a carbon loaded ~876~
paper and inserted into the capacitor roll to contact each foil, at the end of the roll. One example o~ such a resistor is disclosed and claimed in U~S. Patent 3,840,787-Grahame, assigned to the same assignee as the present in-vention.
It is dif~icult to incorporate a resistor in a dry metallized capacitor such as disclosed and described in U.S. Patent 4,037,298-Flanagan, assigned to the same assignee as the present invention. In the ~lanagan patent a capacitor roll section is made up of strips of a synthetic resin dielectric, such as polypropylene, on one side of which a very thin metal layer of aluminum, for example, is vapor deposited. These strips are wound together very tightly in a round roll form and may then lS be used in dry form, i.e., unimpregnated with a dielectric fluid, and perhaps merely encased in a plastic jacket, or, impregnated with a fluid in the usual manner.
Automated manuacture of these capacitors make it uneconomical to connect a separate resistor between the electrode leads of the capacitor, and the difificulties of providing an electrical connection between the resistor and the metallized layers also make the insertion of a carbon loaded paper or other electrode inter-connection means less desirable.
SUMMARY OF T~E INVENTION
It has been discovered that a flexible strip resistor may be incorporated in a dry metallized capac-itor roll by arranging the strip to lie adjacent the finished capacitor roll intermediate the roll ends so that the sprayed metal connection at each end of the roll also connects the considerable length of resistor strip 7~
36-C~-3552 with the capacitor electrodes. The jacket material or several turns of dielectric material around the capacitor roll protects the resistor.
THE D~WINGS
This invention will be better understood when taken in connection with the following description and drawings in which, ~IG. 1 illustrates a preferred form of this invention as a dry metallized capacitox roll ~ection with a discharge resistor incorporated therewith.
FIG. 2 is an exaggerated, sectional, cutaway view of FIG~ l illustrating a discharge resistor connected to the schooped ends of a capacitor.
FIG. 3 is a cutaway view of the embodiment of FIG. 2 illustrating the position of the resistor strip adjacent the circumference of the capacitor roll.
Discussion of Preferred_Embodiments Referring now to FIG~ 1, there is disclosed one preferred embodiment o this invention as a capacitor roll section 10. Roll section 10 comprises a pair of dielectric material strips 11 and 12 which have bee~
metallized as illustrated by metallized surfaces or coatings 13 and 14. As is the usual practicQ, the strlps 11 and 12 are metallized in a manner which leaves metal free marglns 15 and 16 along opposite ed~es of the roll 10. As illustrated in FIG. i, tne roll lO is provided with a hard core 17 which may be of a tubular or solid form and is coextensive through the roll.
'7~
Core 17 is preferably of a haxd non-conductive material such as one of the synthetic resins, for example, polypropylene. In the practice of this invention, core 17 is used as a single use arbor on which to wind hard roll 10 much in the manner described in UOS. Patent 3,153,180-Bellmore, assigned to the same assignee as the present invention. The winding process to wind a hard roll 10 may be carried out on various winding machines, the one shown in U.S. Patent 2,328,520-West, assigned to the same assignee of the present invention being one example.
In the winding process of roll 10, the strips 11 and 1~ are laterally offset with respect to each other in order that each roll edge or end will display an offset with its metallized coatings at the edge of the strip. Therefore, suitable leads may be attached to the roll ends through utilization of the well known schooping process. There is minimal danger of the schooping material penetrating sufficiently into the roll edge to electrically short the other metallized surface ~ecause of the free margin construction.
Referring now to FIG. 2 there is illustrated a preferred application of the resistor of this invention to the capacitor roll section 10 of ~IG 1.
After the roll section of FIG. 1 is wound in roll form on a roll winding machine, a resistor strip element 1 is placed adjacent the roll as ilLustrated in FIG. Z.
Thereafter sevexal turns of an unmetallized dielectris 19 is wound about the roll to retain the resistor 18 in its illustrated position. Dielectric turns 19 are ordinarily used to hold the roll 10 strips in position, to protect the roll from ~ndue abrasion, etc. and more particularly to act as a shrunk on sleeve ror the roll 10.
3'7~
In this latter connection, when the roll 10 i5 heated the sleeve will shrink radially to tightly engage the roll for retained tightness.
As illustrated in FIG. 2, with the roll in its wound form, and resistor element 18 in position, the ends 20 and 21 of the roll section 10 are coated with layers 22 and 23 of an appropriate bonding metal (such as aluminum for example) by means of a schooping process or other appropriate process. In this instance, the schooping metal layers 22 and 23 cover each end of the roll section 10 respectively, and make contact with the resistor element 18, at the same time as they make contact with the leads 24 and 25. This contacting means is best shown with respect to FIG. 2.
Referring now to FIG. 3, the capacltor roll 10 is shown in a partial and cross-sectional view to illustrate the reLationship of the elements. In FIG. 3 the die-lectric strips 11 a~d 12 are offset with respect to each other so that one of the metallized surfaces-jl4 extends at the upper end 26 of roll 10 and the other metallized surface 13 extends at the lower end 21 of roll 10. The resistor element 18 lies adjacent the outer part of the roll 10 and its ends either extend slightly past one end of the roll 10, as shown at the uppe~ end 20 of roll 10, or is generally flush with the roll 10 as shown at the bottom end 21. Thereafter, one or more turns 19 of a suitable dielectric strip are wound a~out roll 10 to serve as a means of protectlon to the resistor element 18 and to serve as a protective wrapper or casing for the roll.
6~
After assembly as illustrated in FIG. 3, the roll ends 20 and 21 are subjected to a schooping operation whereby a molten metal such as aluminum or zinc is spray-coated over the ends of 20 and 21 of the S roll to form the conducting metal layers 22 and 23. The conducting metal 22 and 23 contact the exposed metallized layers 13 and 14 of the capacitor roll 10, and while so doing, also contact the ends of the resistor element strip 18~ The resistor ends (or the leads of a resistor) may be positioned at the very end OL the roll 10 as to slightly overlap the ends. They may also be slightly shorter than the roll depending on the precise bounds of the schooped metal layer. A p~ir of leads 24 and 25 for the electrodes of the capacitor are joined to the schooped layers 22 and 23. By this means separate joining soldering or welding operations or other resistox locations are eliminated. The preferred ~esistor concept of this invention i~ applicable only to tho~e capacitors which have metallized dielectrics and schooped ends.
The resistor el~ment 18 of this invention may ta.~e the form of man~ well known types of flexible or thin strip resistors, so long as they lie closely adjacent the capacitor roll sec~ion with minimum projection, and whose ends may be easily schooped by the same process used to schoop the ends of the capacitor. In a preferred form of this invention the resistor 18 is a paper strip in T,ihich a carbon material has been incorporated to pro~Jide a predetermined resistance per unit of length of s~rip.
Whlle resistor 18 may be positioned elseT~he~e in the roll it is preferred to uti~ize lt at the outer extremity of the roll where capacitor operating temp-36 C~-3552 erature effects of the roll are minimized and where the resistor 18 is not in the electrical field~ It is not desirable to position the resistor la in the interior portion of the capacitor roll for capacitors rated above about 250 volts AC because these capacitors must be wound extremely tightly with close tolerances in order to eliminate all gaps and spaces, and the presence of a resistor strip between the roll windings could cause problems.
In one practice of this invention capacitor rolls were made up in accordance with the structure shown in FIG. 3. The capacitor was rated at 240 VAC
and was about 1.5 inches in length and 0.7S inch in diameter. Alternate resistors 18 used carbon loaded paper strips of 0.5 inch width and about 1.5 and 0.1 inches length. The resistor strip was placed flush with the roll and held in plaze by several turns of unmetall-ized polypropylene. The resistor element was abcut as long (or wide) as the roll and the resistor énds were exposed at each end of the roll. 30th ends of the roll were schooped and the metal spray from this operation joined the capacitor electrodes and the resistor ends in one operation. The practice of this invention may be applied to capacitors other than roll capacitors such as flat or stacked capacitors which are also metallized and which use schooped ends to join the electrodes. The cross-section of a flat or stacked capacitor reveals the same array of superimposed contiguous layers of dle-lectric and metallized layers. In a flat capacitor, one dimension, such as a width, is a predetermined dimension, and the resistor element or its leads is at least of the same dimension so ~hat in the assembled 3t~
~6-CA-3552 relationship each of the resistor ends or leads are ex posed at a respective end of the capacitor for the schoop-ing material. The resistor strip lies flush wlth the flat stack. It is important in this invention that any capa-5 citor section be a metallized section and the resistor tobe quite flat to fit flush with the capaci~or section so that the schooping operation provides a simultaneous electrode and resistor connection.
The practice of this invention is applicable to various metallized capacitors regardless o the dielectric material, e.g. metallized paper, metallized polypropylene and other metallized materials. It is the simultaneous joining of the resistor ends by the metal spray or schoop-ing process which is more important. In this connection the resistor element 18 may take various alternate shapes and modifications. For example, an electrically conduct-ing liquid or ink may be deposited on the exterior of the capacitor roll 10, for exampLe, by printing, depositing or ~praying, and the~ dried or solidified to form resistor 18 of an appropriate shape and resistance. The ~esistor may also be a suitable wrap material of for example, an eLectrically conducting synthetic resin or paper material and wrapped about roll 10 in the same manner and posltion as wrap 19, although a further non-conducting wrap may then be desirable.
While this invention has been disclosed with respect to particular embodiments thereof, numerous modifications may be made by those skilled in the art without departing from its true spirit and scope.
Therefore, it is intended that the appended claims cover all such modlfications and variations which come ~ithin the true spirit and scope of the present inventionO
Claims (8)
1. In an electrical capacitor comprising an array of dielectric strips with metallized electrodes thereon, said strips being arranged in contiguous layer relationship with alternate metal electrodes and dielectric layers, said strips having a predetermined length and arranged in offset relationship so that alternate metallized layers are evenly exposed at each end of the array, and a resistor positioned adjacent a dielectric strip in layer relationship thereto with the ends of said resistor extending at least to about the ends of said array, and a schooped metal layer at each end of said array to simultaneously connect one end of said resistor and one electrode of said capacitor at each end of said array.
2. The invention as recited in Claim 1 wherein said resistor is a thin flexible strip material.
3. An electrical capacitor comprising a series of metallized dielectric strips wound in a roll form of a predetermined width and in offset relationship so that one edge of one metallized coating of one dielectric of strip is exposed at each end of the roll, and a resistor element adjacent said roll in coaxial and contiguous relationship thereto with the ends or leads of said resistor being at least at the ends of the roll, and a schooped layer of metal on each end of said roll and simultaneously joining said resistor and one of said electrodes in electrical connection at each end of said roll.
4. The invention as recited in Claim 2 wherein said resistor is a flexible strip extending about the ends of said roll.
5. The invention as recited in Claim 3 wherein said resistor element is a flexible strip of a dielectric material which incorporates an electrically conductive material therein to provide a predetermined resistance.
6. The invention as recited in Claim 4 wherein said roll comprises strips of metallized synthetic resin film.
7. The invention as recited in Claim 5 wherein additional layers of a dielectric material are wound about said roll and said resistor.
8. A method of incorporating a resistor in a capacitor roll comprising -(a) winding metallized dielectric strips in roll form to provide a capacitor whose electrodes are offset at each end of the roll;
(b) inserting a resistor strip element adjacent the roll so that the ends of the resistor are positioned at about the roll ends;
(c) winding a dielectric strip about said roll and said resistor;
8. A method of incorporating a resistor in a capacitor roll comprising -(a) winding metallized dielectric strips in roll form to provide a capacitor whose electrodes are offset at each end of the roll;
(b) inserting a resistor strip element adjacent the roll so that the ends of the resistor are positioned at about the roll ends;
(c) winding a dielectric strip about said roll and said resistor;
Claim 8 continued:
(d) schooping the ends of said roll to simultaneously join said resistor ends and said capacitor electrodes.
(d) schooping the ends of said roll to simultaneously join said resistor ends and said capacitor electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000421438A CA1188762A (en) | 1983-02-11 | 1983-02-11 | Combined capacitor and resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000421438A CA1188762A (en) | 1983-02-11 | 1983-02-11 | Combined capacitor and resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188762A true CA1188762A (en) | 1985-06-11 |
Family
ID=4124551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421438A Expired CA1188762A (en) | 1983-02-11 | 1983-02-11 | Combined capacitor and resistor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1188762A (en) |
-
1983
- 1983-02-11 CA CA000421438A patent/CA1188762A/en not_active Expired
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