CN200965815Y - A voltage sensitive resistor with the arc quenching flame retardant function - Google Patents
A voltage sensitive resistor with the arc quenching flame retardant function Download PDFInfo
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- CN200965815Y CN200965815Y CN 200620035860 CN200620035860U CN200965815Y CN 200965815 Y CN200965815 Y CN 200965815Y CN 200620035860 CN200620035860 CN 200620035860 CN 200620035860 U CN200620035860 U CN 200620035860U CN 200965815 Y CN200965815 Y CN 200965815Y
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- insulation
- varistor
- voltage
- extraction electrode
- housing
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Abstract
The utility model relates to a voltage varistor, in particular to a quenching arc and fire retardant voltage varistor, which has a shell and a resistance noumenon arranged in the shell; an interspace is positioned between the inner wall of the shell and the outer wall of the voltage varistor which serves as an insulating non combustible material container filled with insulating non combustible material to form an insulating noncombustible material stratum. The utility model is characterized in that the voltage resistance noumenon is composed of a voltage sensitive ceramics sheet, a first extraction electrode and a second extraction electrode. Two inner electrodes are respectively arranged on two parallel surfaces of the voltage sensitive ceramics and are respectively connected with one end of the first extraction electrode and one end of the second electrode in a conduction manner; the other end of the first extraction electrode and the other end of the second extraction electrode go through the insulating non combustible material stratum and stretch out of the shell. The utility model can simplify the manufacturing working procedure of products, save manufacturing material and reduce manufacturing cost.
Description
Technical field
The utility model relates to a kind of varistor, especially a kind of varistor with arc-extinguishing flame-retarding function.
Background technology
Varistor is widely used in the various electronic equipments as a kind of surge protection element, in use finds, when extraneous surge energy surpassed the tolerance of piezo-resistance, piezo-resistance can breakdown short circuit.In side circuit, piezo-resistance is connected across between the live wire and zero line of power supply often, transient energy is very big during short circuit, the punch through damage place can produce localized hyperthermia, the insulation and moisture that voltage-sensitive ceramic substrate outside may be wrapped up in envelope be wrapped up in seal (being main material with organic materials such as epoxy resin usually) and ignite, and might cause electric equipment such as air-conditioning on fire when serious.
At this potential safety hazard, there have been some technical measures to be used to prevent the generation of accident on fire.For example, the present inventor just once disclosed " a kind of varistor with arc-extinguishing flame-retarding function " in Chinese utility model patent ZL200420034541.8 number, this varistor has housing and is encapsulated in the interior piezo-resistance body of housing, described piezo-resistance body is by the voltage-sensitive ceramic substrate and seal is wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed constituted, be provided with the interior electrode of two separation on the surface of described voltage-sensitive ceramic substrate, on the piezo-resistance body, be connected with first extraction electrode and second extraction electrode, one end of described first extraction electrode and second extraction electrode is connected with two interior electrodes conduct of described voltage-sensitive ceramic substrate surface respectively, the other end of described first extraction electrode and second extraction electrode passes insulation and wraps up in seal and extend to outside the housing, it is characterized in that having the gap and constituting airtight powder accommodation cavity between the outer wall of the inwall of described housing and piezo-resistance body, in described powder accommodation cavity, be filled with insulation and do not fire powder and constitute powder bed is not fired in the insulation of piezo-resistance body parcel.In addition, the present inventor also discloses " a kind of varistor with arc-extinguishing flame-retarding function " in Chinese utility model patent ZL200420033754.9 number, " a kind of varistor with anti-flaming function " disclosed in No. 200520035393.6, Chinese utility model patent ZL, " a kind of varistor with arc-extinguishing flame-retarding function " disclosed in No. 200520035394.0, Chinese utility model patent ZL, in No. 200510021631.2, Chinese invention patent application, disclose " a kind of electronic component ", in No. 200610020136.4, Chinese invention patent application, disclose " a kind of long life explosion-proof type piezoresistor " or the like with anti-flaming function.The disclosed technical scheme of these patents or patent application all has advantage separately, and can prevent the electrical equipment pyrophoricity accident that causes because of the varistor short circuit effectively, thereby has obtained better technical effect, makes product have very high practical value.
In technique scheme, all define the piezo-resistance body mainly by the voltage-sensitive ceramic substrate with seal is wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed constituted.But, recent discovers, in fact can also do further to improve with regard to the piezo-resistance main body structure in the above-mentioned prior art scheme, thereby optimize product structure, and the corresponding effect of playing simplification production process, saving manufacturing materials, reducing the production cost.
The utility model content
The purpose of this utility model promptly is that the piezo-resistance main body structure of above-mentioned existing product is improved, the varistor with arc-extinguishing flame-retarding function that a kind of structure is more simple to provide, cost of manufacture is lower.
In order to realize above-mentioned utility model purpose, we anatomize piezo-resistance main body structure in the above-mentioned existing product, and drawn thus to draw a conclusion: in the given technical scheme of above-mentioned existing patent or patent application, seal is wrapped up in the insulation on the piezo-resistance body can be all or local removing.
This be because, in above-mentioned existing product, set insulation is wrapped up in seal and is in the form of the voltage-sensitive ceramic substrate being wrapped up in fully envelope on the piezo-resistance body, and this also is the basic structure that proposes No. 200420034541.8 traditional pressure sensitive resistor products before the Chinese utility application the applicant.Because traditional pressure sensitive resistor product there is no extra additional housing, the also powder accommodation cavity and the incombustible material layer that insulate between the outer wall of the inwall of housing and piezo-resistance body not, therefore, it is exactly one of necessary structure of traditional pressure sensitive resistor product that seal is wrapped up in the insulation that the voltage-sensitive ceramic substrate is wrapped up in envelope fully, seal is wrapped up in this insulation mainly can play following three effects: 1, the interior electrode to the voltage-sensitive ceramic substrate surface protects, and guarantees itself and outside other electric elements insulation; 2, arcing phenomena appears in the edge that prevents the voltage-sensitive ceramic substrate, prevents that promptly two interior electrodes of voltage-sensitive ceramic substrate surface from short circuit occurring by this arcing phenomena; 3, play certain moisture-proof role.But, after the technical scheme given by aforementioned a plurality of patents improved traditional varistor, the above-mentioned insulation that the voltage-sensitive ceramic substrate is wrapped up in envelope was fully wrapped up in three effects that seal plays and just can be replaced by structures such as the housing in the above-mentioned patented product, insulation incombustible material layers whole or in part.Therefore, if seal is wrapped up in the whole or local insulation of removing on the piezo-resistance body, just can reach the purpose of further optimizing product structure.
According to above-mentioned analysis, we wrap up in seal by the insulation of the voltage-sensitive ceramic substrate being wrapped up in fully envelope and remove, the voltage-sensitive ceramic substrate is in do not wrap up in envelope or locally is insulated the state that seal is wrapped up in envelope of wrapping up in, just can obtain a kind of novel varistor with arc-extinguishing flame-retarding function.
Specifically, varistor with arc-extinguishing flame-retarding function of the present utility model has housing and is contained in the interior piezo-resistance body of housing, have the gap between the outer wall of the inwall of described housing and piezo-resistance body and constitute insulation incombustible material container cavity, in described insulation incombustible material container cavity, be filled with the insulation incombustible material and constitute insulation incombustible material layer, it is characterized in that described piezo-resistance body is by the voltage-sensitive ceramic substrate, first extraction electrode and second extraction electrode constitute, on two of the voltage-sensitive ceramic substrate parallel surfaces, be provided with two interior electrodes discretely, one end of described first extraction electrode is connected with described two interior electrodes conduct of voltage-sensitive ceramic substrate surface respectively with an end of second extraction electrode, and the other end of the other end of described first extraction electrode and second extraction electrode passes the insulation incombustible material layer in the described insulation incombustible material container cavity and extends to outside the housing.
In the given above-mentioned basic technical scheme of the utility model, can not be provided with fully seal is wrapped up in the insulation of voltage-sensitive ceramic substrate and interior electrode coating.This be because, owing to have housing and insulation incombustible material layer in the structure of product, the interior electrode that this housing and insulation incombustible material layer have played the voltage-sensitive ceramic substrate surface protects, guarantees the effect that itself and outside other electric elements insulate, simultaneously, the insulation incombustible material layer of institute's filling can also prevent more efficiently that arcing phenomena from appearring in the edge of voltage-sensitive ceramic substrate, when the material to the structure of housing or insulation incombustible material layer carries out when suitably preferred, above-mentioned housing and insulation incombustible material layer can also play certain moisture-proof role.So, aforementioned with the voltage-sensitive ceramic substrate and in the insulation that coats fully of electrode wrap up in seal and can be cancelled fully.
In addition, be not provided with fully with the voltage-sensitive ceramic substrate and in the insulation of electrode coating wrap up under the situation of seal, can also suitably reduce the interior electrode of voltage-sensitive ceramic substrate surface and the area ratio of this voltage-sensitive ceramic substrate surface, the edge of electrode can further prevent also that apart from the distance at this voltage-sensitive ceramic substrate surface edge (those skilled in the art are referred to as to increase " staying the limit amount ") relatively far away arcing phenomena from appearring in the edge of voltage-sensitive ceramic substrate in promptly allowing.
In the technical solution of the utility model, insulation also can be set at the surface local of voltage-sensitive ceramic substrate wrap up in seal, at this moment, promptly be that surface portion (that is marginal portion of voltage-sensitive ceramic substrate) at the voltage-sensitive ceramic substrate between two interior electrodes is provided with insulation and wraps up in seal, the setting that seal is wrapped up in this insulation also is arcing phenomena to occur for the edge that further prevents the voltage-sensitive ceramic substrate.
When the surface local at the voltage-sensitive ceramic substrate is provided with insulation when wrapping up in seal, this insulation wrap up in seal can be wrapping up in of constituting of insulation glaze seal, organic siliconresin constitute wrapping up in of wrapping up in that seal or organosilicon coating constitute seal, phenolic resins constitute wrapping up in of wrapping up in that seal, insulating varnish constitute seal, epoxy resin constitute wrap up in that seal and two or more composite insulating materials constitute wrap up in seal or the like.
In varistor of the present utility model, described housing can be the insulation shell of being made by insulating material, can also be the nonisulated housing of being made by non-insulating material (as metal material).When adopting insulation shell, the insulating material that constitutes housing can be ambroin or various insulating material such as insulating paper, insulation timber.When adopting the housing of making by non-insulating material, can also or be coated with coating insulation material at this enclosure interior liner, certainly, the utility model also is not precluded within the outer spacer of this housing or is coated with the situation of coating insulation material.
In the utility model, described housing can be hermetic housing, but mode is that housing is provided with the exhaust outlet that insulation incombustible material container cavity is connected with outside preferably.
In addition, when housing is provided with exhaust outlet, can also be provided with the exhaust outlet plugging structure that under gases at high pressure impact, to open in described exhaust ports.In the utility model, above-mentioned exhaust outlet plugging structure can be shutoff sheet or small-sized pressure-relief valve structure or the like.When the actual fabrication product, the setting of above-mentioned exhaust outlet plugging structure opening pressure can be decided according to the specific requirement of product, as long as can open automatically when puncture short appears in product, the gas that produces in the discharging housing gets final product, and the mechanism of its pressure release exhaust and existing pressure cooker are similar.
Consider from the angle of simplifying product structure, reduction product cost, recommend to adopt the shutoff sheet herein as above-mentioned exhaust outlet plugging structure.The shutoff sheet that is adopted can be to stick on the housing and with the shutoff sheet (as aluminium foil, plastic film or the like) of exhaust outlet shutoff, also can be that periphery is fixedlyed connected with the inwall of exhaust outlet and with the shutoff sheet of exhaust outlet shutoff, this kind structure (is applied for title: a kind of long life explosion-proof type piezoresistor) given detailed introduction, so locate to repeat no more in the applicant's No. 200610020136.4 Chinese invention patent applications.Need to prove,, when this exhaust ports is provided with the exhaust outlet plugging structure that can open under gases at high pressure impact, can when making product have anti-burst energy, improve the humidity resistance of product again when on housing, offering exhaust outlet.
In the utility model, above-mentioned insulation incombustible material layer can be to insulate not fire stratum granulosum, also can be insulation fireproof fibre layer.Herein, not fire particle can be insulation and the quartz sand particle that do not fire or mica powder, alumina powder, magnesium hydroxide powder, flake asbestos or the like in said insulation; Said insulation fireproof fibre can be fire resistance fibres such as common and inexpensive asbestos fibre or alumina silicate fibre, alumina fibre, silicon dioxide fibre, glass fibre or the like, this insulation fireproof fibre both can be thread, also can be cotton-shaped, can also be the insulation fireproof fibre fabric that is woven into netted or other shape.Simultaneously, above-mentioned insulation incombustible material layer can be wrapped up in envelope fully with the piezo-resistance body, does not wrap up in the envelope situation of (as the major part of piezo-resistance body is wrapped up in envelope) but only also do not get rid of piezo-resistance body part.
The technical solution of the utility model has overcome long-standing technical prejudice (this prejudice think allowing insulation wrap up in seal the voltage-sensitive ceramic substrate is wrapped up in the envelope condition that is absolutely necessary fully), thus can simplify product production process, save product manufacturing materials, reduce the cost of manufacture of product.In addition, the technical solution of the utility model can also produce following beyond thought effect: wrap up in seal owing to removed the insulation that the voltage-sensitive ceramic substrate is wrapped up in envelope fully, thereby make the heat dispersion of varistor body better.Experimental result proves, when the heat of varistor body can in time conduct and be dispersed into the product outside, will prolong the useful life (concrete principle has given detailed introduction in the applicant's Chinese invention patent application No. 200610020136.4 " a kind of long life explosion-proof type piezoresistors ", repeat no more) of varistor significantly herein.So the technical solution of the utility model also helps to prolong the useful life of product.
Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of varistor among the embodiment 1.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the structural representation of varistor among the embodiment 2.
Fig. 4 is the B-B cutaway view of Fig. 3.
Fig. 5 is the C-C cutaway view of Fig. 3.
Fig. 6 is the structural representation of varistor among the embodiment 3.
Fig. 7 is the D-D cutaway view of Fig. 6.
Fig. 8 is the vertical view of Fig. 6.
Fig. 9 is the E-E cutaway view of Fig. 6.
Figure 10 is the structural representation of varistor among the embodiment 4.
Figure 11 is the F-F cutaway view of Figure 10.
Figure 12 is the vertical view of Figure 10.
Figure 13 is the G-G cutaway view of Figure 10.
Figure 14 is that the shutoff sheet of varistor among Figure 10 is washed out by gases at high pressure and forms the structural representation of exhaust outlet.
Figure 15 is the structural representation of varistor among the embodiment 5.
Figure 16 is the H-H cutaway view of Figure 15.
Figure 17 is the vertical view of Figure 15.
Figure 18 is the J-J cutaway view of Figure 15.
Figure 19 is that the shutoff sheet of varistor among Figure 15 is washed out by gases at high pressure and forms the structural representation of exhaust outlet.
Embodiment
Embodiment 1: as Fig. 1, shown in 2, varistor in the present embodiment has housing 1 and the piezo-resistance body that is contained in the housing 1, have the gap between the outer wall of the inwall of described housing 1 and piezo-resistance body and constitute insulation incombustible material container cavity, in described insulation incombustible material container cavity, be filled with the insulation incombustible material and constitute insulation incombustible material layer 2, it is characterized in that described piezo-resistance body is by voltage-sensitive ceramic substrate 3, first extraction electrode 4 and second extraction electrode 5 constitute, on two of voltage-sensitive ceramic substrate 3 parallel surfaces, be provided with two interior electrodes 6 discretely, 7, one end of one end of described first extraction electrode 4 and second extraction electrode 5 respectively with described two interior electrodes 6 of voltage-sensitive ceramic substrate surface, 7 conductions connect, and the other end of the other end of described first extraction electrode 4 and second extraction electrode 5 passes the insulation incombustible material layer 2 in the described insulation incombustible material container cavity and extends to outside the housing 1.
In the present embodiment, described housing 1 is an insulation shell.Described insulation incombustible material layer 2 does not fire stratum granulosum for insulation.Herein, the quartz sand layer that stratum granulosum is the quartz sand formation is not fired in above-mentioned insulation.
Embodiment 2: shown in Fig. 3～5, the varistor in the present embodiment is similar to embodiment 1, and different is, the described housing 1 of present embodiment is provided with the exhaust outlet that makes a plurality of micropores 8 formations that insulation incombustible material container cavity is connected with outside.In addition, set insulation incombustible material layer 2 is insulation fireproof fibre layer in the present embodiment.Herein, above-mentioned insulation fireproof fibre layer is the asbestos fibre layer that asbestos fibre constitutes.
Embodiment 3: shown in Fig. 6～9, the varistor in the present embodiment is similar to embodiment 2, and different is that present embodiment is provided with the exhaust outlet plugging structure that can open at exhaust outlet 8 places under gases at high pressure impact.In the present embodiment, above-mentioned exhaust outlet plugging structure is to stick on the housing and with the shutoff sheet 9 (the shutoff sheet 9 in this example is aluminium foil) of exhaust outlet 8 shutoff.
Embodiment 4: shown in Figure 10～14, varistor in the present embodiment is similar to embodiment 2, different is, is provided with insulation at the surface portion of the voltage-sensitive ceramic substrate between described two interior electrodes 6,7 (in this example promptly in the marginal portion of voltage-sensitive ceramic substrate 3) in the present embodiment and wraps up in seal 10.Herein, the seal of wrapping up in that seal 10 is epoxy resin formations is wrapped up in above-mentioned insulation.In addition, the insulation incombustible material layer 2 in the present embodiment does not fire stratum granulosum for insulation, and it is the magnesium hydroxide powder layer that magnesium hydroxide powder constitutes that stratum granulosum is not fired in this insulation.Also be provided with exhaust outlet in the present embodiment, and be provided with the exhaust outlet plugging structure that under gases at high pressure impact, to open in described exhaust ports.Described exhaust outlet plugging structure is that periphery is fixedlyed connected with the inwall of exhaust outlet and with the shutoff sheet 12 of exhaust outlet shutoff.Present embodiment has been preset the weak point of a ring-type on housing 1, it is annular ditch groove 13, the housing parts of corral promptly constitutes above-mentioned shutoff sheet 12 within this annular ditch groove 13, and simultaneously, the position at shutoff sheet 12 places has also promptly constituted the exhaust outlet of reserving 11 (referring to Figure 14).In this structure, can be considered as is that the periphery of shutoff sheet 12 is fixedlyed connected with the inwall of exhaust outlet 11 and with exhaust outlet 11 shutoff flexiblely.As shown in figure 14, when being subjected to the gases at high pressure impact, above-mentioned ring-type weak point breaks, and by the shutoff sheet 12 all or part of disengaging housings of annular ditch groove 13 corrals, exhaust outlet 11 is opened.In addition, above-mentioned annular ditch groove 13 also can be made of (the ring-type pit group that promptly constitutes the dotted line shape) a plurality of point-like pits that are arranged in closed circular.
Embodiment 5: shown in Figure 15～19, the varistor in the present embodiment is similar to embodiment 4, and promptly the exhaust outlet plugging structure is that periphery is fixedlyed connected with the inwall of exhaust outlet and with the shutoff sheet 12 of exhaust outlet shutoff.Different is, in the present embodiment, default one (or several) block weakness zone on housing 1, pit 14 as bulk, and housing that should bulk pit position as thin as a wafer, the housing parts of this bulk weak point institute corral promptly constitutes above-mentioned shutoff sheet 12, and simultaneously, the position at shutoff sheet place also promptly constitutes the exhaust outlet of reserving 11 (referring to Figure 19).In this structure, also can be considered as is that the periphery of shutoff sheet 12 is fixedlyed connected with the inwall of exhaust outlet 11 and with exhaust outlet 11 shutoff flexiblely.As shown in figure 19, when being subjected to the gases at high pressure impact, breaking can appear in above-mentioned block weak point, thereby exhaust outlet 11 is opened
In above each embodiment, insulation incombustible material layer 2 all is in the state of the piezo-resistance body being wrapped up in fully envelope, but, also can allow insulation incombustible material layer 2 only piezo-resistance body part be wrapped up in the envelope situation of (as the following major part in the top of piezo-resistance body is wrapped up in envelope), thereby constitute new embodiment.
In addition, in above each embodiment, described housing 1 all is insulation shells of being made by insulating material, still, can also be to make nonisulated housing by non-insulating material (as metal material).When adopting the housing of making by non-insulating material, can also or be coated with coating insulation material at this enclosure interior liner, certainly, also be not precluded within the outer spacer of this housing or be coated with the situation of coating insulation material.Like this, also can constitute new embodiment.
Claims (10)
1, a kind of varistor with arc-extinguishing flame-retarding function, have housing and be contained in the interior piezo-resistance body of housing, have the gap between the outer wall of the inwall of described housing and piezo-resistance body and constitute insulation incombustible material container cavity, in described insulation incombustible material container cavity, be filled with the insulation incombustible material and constitute insulation incombustible material layer, it is characterized in that described piezo-resistance body is by the voltage-sensitive ceramic substrate, first extraction electrode and second extraction electrode constitute, on two of the voltage-sensitive ceramic substrate parallel surfaces, be provided with two interior electrodes discretely, one end of described first extraction electrode is connected with described two interior electrodes conduct of voltage-sensitive ceramic substrate surface respectively with an end of second extraction electrode, and the other end of the other end of described first extraction electrode and second extraction electrode passes the insulation incombustible material layer in the described insulation incombustible material container cavity and extends to outside the housing.
2, varistor as claimed in claim 1 is characterized in that surface portion at the voltage-sensitive ceramic substrate between described two interior electrodes is provided with insulation and wraps up in seal.
3, varistor as claimed in claim 1 is characterized in that described housing is an insulation shell.
4,, it is characterized in that described housing is provided with the exhaust outlet that insulation incombustible material container cavity is connected with outside as claim 1 or 2 or 3 described varistors.
5, varistor as claimed in claim 4 is characterized in that described exhaust ports is provided with the exhaust outlet plugging structure that can open under gases at high pressure impact.
6, varistor as claimed in claim 5 is characterized in that described insulation incombustible material layer does not fire stratum granulosum for insulation.
7, varistor as claimed in claim 6 is characterized in that it is the quartz sand layer that quartz sand constitutes that stratum granulosum is not fired in described insulation.
8, varistor as claimed in claim 6 is characterized in that it is the magnesium hydroxide powder layer that magnesium hydroxide powder constitutes that stratum granulosum is not fired in described insulation.
9, varistor as claimed in claim 5 is characterized in that described insulation incombustible material layer is insulation fireproof fibre layer.
10, varistor as claimed in claim 9 is characterized in that described insulation fireproof fibre layer is the asbestos fibre layer that asbestos fibre constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620035860 CN200965815Y (en) | 2006-10-13 | 2006-10-13 | A voltage sensitive resistor with the arc quenching flame retardant function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620035860 CN200965815Y (en) | 2006-10-13 | 2006-10-13 | A voltage sensitive resistor with the arc quenching flame retardant function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200965815Y true CN200965815Y (en) | 2007-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620035860 Expired - Lifetime CN200965815Y (en) | 2006-10-13 | 2006-10-13 | A voltage sensitive resistor with the arc quenching flame retardant function |
Country Status (1)
| Country | Link |
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| CN (1) | CN200965815Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162631B (en) * | 2006-10-13 | 2010-05-12 | 李炬 | Piezoresistor having arc extinction fire retardant function |
-
2006
- 2006-10-13 CN CN 200620035860 patent/CN200965815Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162631B (en) * | 2006-10-13 | 2010-05-12 | 李炬 | Piezoresistor having arc extinction fire retardant function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Tieda Electronic Co., Ltd., Chengdu Assignor: Li Ju|Tan Yicheng|Jing Lvwei Contract record no.: 2010510000053 Denomination of utility model: Piezoresistor having arc extinction fire retardant function Granted publication date: 20071024 License type: Exclusive License Record date: 20100721 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071024 |
|
| EXPY | Termination of patent right or utility model |