CN209017314U - A kind of electret microphone - Google Patents
A kind of electret microphone Download PDFInfo
- Publication number
- CN209017314U CN209017314U CN201821899454.7U CN201821899454U CN209017314U CN 209017314 U CN209017314 U CN 209017314U CN 201821899454 U CN201821899454 U CN 201821899454U CN 209017314 U CN209017314 U CN 209017314U
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- China
- Prior art keywords
- circuit board
- shell
- electret microphone
- utility
- protection cap
- 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.)
- Withdrawn - After Issue
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- 230000005669 field effect Effects 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- -1 Polypropylene Polymers 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Abstract
The utility model embodiment discloses a kind of electret microphone, including shell, vibration component, circuit board, field-effect tube and protection cap；Wherein, the shell is tubular structure open at one end, and one end opposite with the opening is provided with the first sound hole；The vibration component is arranged in the interior of shell, and is electrically connected with the circuit board；The circuit board cover is closed over said opening；The field-effect tube is located at the shell exterior, and is electrically connected with the circuit board；The protection cap is connect with the circuit board, and the field-effect shroud is buckled in the cavity of the protection cap, and through-hole is provided on the circuit board, and the through-hole is located at the protection housing and buckles in space.Technical solution provided by the embodiment of the utility model can increase the back cavity of electret microphone by protection cap, and be protected to field-effect tube, so that electret microphone can carry out flat frequency response in lower frequency range.
Description
Technical field
The utility model embodiment belongs to electroacoustic switch technology field, specifically, being related to a kind of electret microphone.
Background technique
Electret microphone is a kind of novel microphone manufactured with electret, its simple, sensitivity with structure
The advantages that high, is widely used in language pickup, acoustical signal processing etc., for example, its most typical application is electret words
Cylinder.
But frequency response of the electret microphone in 50~20kHz frequency range is all relatively flat, generally more than 10
KHz has a formant.However, being needed in lower frequency range when using microphone in some special equipment
Flat frequency response is carried out, for example, the frequency requirement of the electret microphone in hearing aid microphone is more special, it is required that
Flat frequency response is carried out in 2kHz~8kHz frequency range.Existing most of electret microphones, which are unable to satisfy, to be wanted
It asks.
Utility model content
In view of this, the utility model embodiment provides a kind of electret microphone, may make electret microphone compared with
Flat frequency response is carried out in low frequency range.
The technical issues of to solve in the prior art, the utility model embodiment provides a kind of electret microphone, packet
Include shell, vibration component, circuit board, field-effect tube and protection cap；Wherein,
The shell is tubular structure open at one end, and one end opposite with the opening is provided with the first sound hole；
The vibration component is arranged in the interior of shell, and is electrically connected with the circuit board；
The circuit board cover is closed over said opening；
The field-effect tube is located at the shell exterior, and is electrically connected with the circuit board；
The protection cap is connect with the circuit board, and the field-effect shroud is buckled in the cavity of the protection cap；
Through-hole is provided on the circuit board, the through-hole is located at the protection housing and buckles in space.
Optionally, the making material of the protection cap is metal.
Optionally, the vibration component include the washer for being sequentially placed and being encapsulated in the interior of shell, vibrating diaphragm, gasket,
Pole plate and elastic slice；
The edge of the pole plate is equipped with multiple equally distributed notches, by described between the pole plate and the circuit board
Elastic slice electrical connection, wherein the circuit board is equipped with the electrode being electrically connected with the elastic slice.
Optionally, the elastic slice includes two segmental arcs and two flat segments, the segmental arc and the flat segments interval
First place connects；
The segmental arc is provided with salient point on the segmental arc towards the circuit board protrusion,
The arc engaging lug towards the circuit board protrusion is provided in the flat segments；
The electrical connection of the salient point and the arc engaging lug and the circuit board, the flat segments and the pole plate connect
It connects.
Optionally, the shell includes cylindrical sidewall and bottom plate；
The circuit board and the bottom plate cover conjunction at the both ends of the cylindrical sidewall, the cylindrical sidewall and the bottom respectively
Gasket is provided between plate and between the cylindrical sidewall and the circuit board；
The first sound hole setting is covered on the bottom plate, and on the bottom plate covers first sound hole
Damp cloth.
Optionally, the pole plate is equipped with the second sound hole.
Technical solution provided by the embodiment of the utility model can increase the back cavity of electret microphone by protection cap, and
Field-effect tube is protected, is rung so that electret microphone can carry out flat frequency in lower frequency range
It answers.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model embodiment, for those of ordinary skill in the art, what is do not made the creative labor
Under the premise of, it is also possible to obtain other drawings based on these drawings.
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the utility model
A part of embodiment, the illustrative embodiments and their description of the utility model embodiment are for explaining that the utility model is implemented
Example, does not constitute the improper restriction to the utility model embodiment.
In the accompanying drawings:
Fig. 1 is the decomposition texture schematic diagram of the electret microphone of the utility model embodiment；
Fig. 2 is the structural schematic diagram of the electret microphone of the utility model embodiment；
Fig. 3 is the structural schematic diagram of the pole plate of the utility model embodiment；
Fig. 4 is the structural schematic diagram of the elastic slice of the utility model embodiment；
Fig. 5 is that the shell group plate of the utility model embodiment and circuit board group board group fill flow diagram；
The shell group plate and the structural schematic diagram after the assembling of circuit board group board group that Fig. 6 is the utility model embodiment.
Description of symbols
10: shell；11: the first sound holes；12: cylindrical sidewall；13: bottom plate；14: gasket；20: vibration component；21: pad
Circle；22: vibrating diaphragm；23: gasket；24: pole plate；241: notch；242: the second sound holes；25: elastic slice；251: segmental arc；252: flat
Straight section；253: salient point；254: arc engaging lug；30: circuit board；31: through-hole；40: field-effect tube；50: protection cap；60: shell
Group plate；61: circuit board group plate；62: cylindrical sidewall group plate；63: bottom plate group plate.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model embodiment a part of the embodiment, instead of all the embodiments.Based on the utility model reality
Apply the embodiment in example, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, the range of the utility model embodiment protection is belonged to.
Inventor has found that current electret microphone is in 50~20kHz frequency in the process of implementing the utility model
Frequency response in range is all relatively flat, generally has a formant in more than 10 kHz.However, in some special equipment
When upper use microphone, need to carry out flat frequency response in lower frequency range, existing most of electrets pass
Sound device is unable to satisfy requirement.
Therefore, to solve defect in the prior art, the utility model embodiment provides a kind of electret microphone, can make
It obtains electret microphone and carries out flat frequency response in lower frequency range.
The embodiment of the utility model embodiment is described in detail below in conjunction with accompanying drawings and embodiments, whereby to this reality
With new embodiment, how applied technology method solves technical problem and reaches the realization process of technical effect to fully understand
And implement accordingly, it is described further below in conjunction with structure of the attached drawing to the utility model.
The same or similar label correspond to the same or similar components in the attached drawing of the utility model embodiment；It is practical at this
In the description of new embodiment, it is to be understood that if having the orientation or position of the instructions such as term " on ", "lower", "left", "right"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model embodiment and simplification is retouched
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore the terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limit to the utility model embodiment
System, for the ordinary skill in the art, can understand the concrete meaning of above-mentioned term as the case may be.
Fig. 1 is the decomposition texture schematic diagram of the electret microphone of the utility model embodiment, and Fig. 2 is that the utility model is real
The structural schematic diagram of the electret microphone of example is applied, as depicted in figs. 1 and 2.
The utility model embodiment provides a kind of electret microphone, including shell 10, vibration component 20, circuit board
30, field-effect tube 40 (FET, Field Effect Transistor, field effect transistor, abbreviation field-effect tube) and protection
Lid 50.
Wherein, shell 10 is tubular structure open at one end, and one end opposite with opening is provided with the first sound hole 11.Vibration
Dynamic component 20 is arranged inside shell 10, and is electrically connected with circuit board 30.The lid of circuit board 30 closes in opening.Field-effect tube 40
It is electrically connected outside shell 10, and with circuit board 30.Protection cap 50 is connect with circuit board 30, and field-effect tube 40 is covered and is detained
In the cavity of protection cap 50；Through-hole 31 is provided on circuit board 30, which is located in the protection cap 50 cover button space,
Protection cap 50 is buckled space with the cover that circuit board 30 surrounds and is connected to 10 inner space of shell by through-hole 31, after increasing microphone
Chamber.
Technical solution provided by the embodiment of the utility model can increase the back cavity of electret microphone by protection cap 50,
And field-effect tube 40 is protected, it is rung so as to adjust frequency of the electret microphone in lower frequency range
It answers, so that electret microphone can carry out flat frequency response in lower frequency range.
In a kind of achievable embodiment of the utility model, circuit board 30 is closed by process for pressing lid in shell 10
Opening passes through the scheme phase that is sealed the gap between circuit board 30 and shell 10 with glue after laser spot welding with the prior art
Than, the assembling cost of electret microphone can be greatly reduced by process for pressing, and technology difficulty is small, it is easily operated.
Further, in a kind of achievable embodiment of the utility model, the making material of protection cap 50 is metal.Gold
The protection cap 50 for belonging to material can prevent interference of the external electromagnetic to the component in protection cap 50 and shell 10.The ruler of protection cap 50
Very little to be adjusted according to different demands, for example, the projected area on circuit board 30, protection cap 50 is the two of field-effect tube 40
Times.Relative to circuit board 30, the height of protection cap 50 is twice of 40 height of field-effect tube.The size of different protection caps 50
The rear cavity space of adjustment microphone can be corresponded to, so as to adjust frequency of the electret microphone in lower frequency range
Response.
With continued reference to Fig. 1, in a kind of achievable embodiment of the utility model, vibration component 20 includes being sequentially placed
And it is encapsulated in the washer 21 inside shell 10, vibrating diaphragm 22, gasket 23, pole plate 24 and elastic slice 25.The bottom of washer 21 and shell 10
Portion is in close contact, and can prevent the bottom of vibrating diaphragm 22 and shell 10 from hard contact occurs by washer 21.Pole plate 24 and circuit board 30
Between be electrically connected by elastic slice 25, wherein circuit board 30 is equipped with the electrode being electrically connected with elastic slice 25.
Gasket 23 is between pole plate 24 and vibrating diaphragm 22, and due to the buffer action of gasket 23, vibrating diaphragm 22 and pole plate 24 are constituted
One capacitor.After vibrating diaphragm 22 is caused vibration by sound wave effect, the distance between vibrating diaphragm 22 and pole plate 24 also can be with generations
Small variation, and this variation can cause the variation of capacitor between vibrating diaphragm 22 and pole plate 24, in this way, voice signal just converts
At electric signal.According to physics knowledge, the positive area of capacitor and the two metal plates that two parallel metal sheets are constituted has
It closes, positive area is smaller, and capacitor is smaller.Using this principle, the utility model embodiment when solving the problems, such as parasitic capacitance,
Using the pole plate 24 with jagged 241, specifically, referring to Fig. 3, the edge of pole plate 24 is equipped with multiple equally distributed notches
241, notch 241 includes but is not limited to for arc-shaped or zigzag.Pole plate 24 and vibrating diaphragm can be significantly reduced by notch 241
22 positive area, to inhibit the parasitic capacitance generated between pole plate 24 and vibrating diaphragm 22.Furthermore it is also possible on pole plate 24
Equipped with the second sound hole 242.The positive area of pole plate 24 and vibrating diaphragm 22 is reduced by the progress of the second sound hole 242 1.
In a kind of achievable embodiment of the utility model, the implementation of elastic slice 25 include it is a variety of, one kind can be achieved
Mode be, referring to fig. 4, elastic slice 25 include two segmental arcs 251 and two flat segments 252, segmental arc 251 and flat segments 252
Interval first place connects.Wherein, segmental arc 251 is towards 30 protrusion of circuit board, and salient point 253, flat segments are provided on segmental arc 251
The arc engaging lug 254 towards 30 protrusion of circuit board is provided on 252.Salient point 253 and arc engaging lug 254 and circuit board 30
Electrical connection, flat segments 252 are connect with pole plate 24.Segmental arc 251 and flat segments 252 are spaced first place and connect to forming ring structure,
Reduce the weight of elastic slice 25, saves cost of manufacture.Positive area between the elastic slice 25 and shell 10 of ring structure is smaller, because
Parasitic capacitance is not likely to produce between this elastic slice 25 and metal shell 10.By salient point 253 and arc engaging lug 254 is formed and circuit
The multiple spot of plate 30 is electrically connected, and can prevent the poor contact situation of elastic slice 25 and circuit board 30 from occurring.
With continued reference to Fig. 1, in a kind of achievable embodiment of the utility model, shell 10 includes cylindrical sidewall 12 and bottom
Plate 13.Circuit board 30 and bottom plate 13 cover conjunction at the both ends of cylindrical sidewall 12 respectively.Accommodating cavity is enclosed by cylindrical sidewall 12, is shaken
Dynamic component 20 is mounted in accommodating cavity.Bottom plate 13, which is played, plays supporting role to vibration component 20.In order to seal accommodating cavity, tubular
It is provided with gasket 14 between side wall 12 and bottom plate 13 and between cylindrical sidewall 12 and circuit board 30, gasket 14 includes but not
It is limited to be made up of PP (Polypropylene, polypropylene) material.First sound hole 11 is arranged on base 13, and bottom plate
The damping cloth for covering the first sound hole 11 is covered on 13.It can prevent the sundries such as dust, steam from passing through tubular by gasket 14
Gap between side wall 12 and bottom plate 13 or between cylindrical sidewall 12 and circuit board 30 enters in shell 10, can by damping cloth
It prevents dust and other impurities from entering in shell 10 by the first sound hole 11 of bottom plate 13, can reach by gasket 14 and damping cloth
Protect the purpose of electret microphone internal element.
It is introduced below to how electret microphone provided by the utility model makes.
Referring to figs. 5 and 6, making step is as follows:
Step S101: obtaining respectively includes the shell group plate 60 of multiple shells 10 and the circuit including multiple circuit boards 30
Board group plate 61；
Step S102: by the opening of shell 10, a vibration component 20 is individually assembled in each shell 10；
Step S103: circuit board group plate 61 is pressed together on shell group plate 60, forms electret microphone group plate, wherein
Each circuit board 30 covers the opening for unifying a shell 10；
Step S104: field-effect tube 40 is installed on each circuit board 30；
Step S105: protection cap 50 is installed on each circuit board 30, wherein the cover of field-effect tube 40 is buckled in by protection cap 50
In the cavity of protection cap 50；Through-hole 31 is provided on circuit board 30, through-hole 31 is located in the cover button of protection cap 50 space.
Step S106: cutting electret microphone group plate is to obtain multiple individual electret microphones.
Further, for step S102, by the opening of shell 10, the individually assembling one in each shell 10
A vibration component 20, comprising: by opening, be sequentially placed and encapsulate washer 21, vibrating diaphragm 22, gasket 23, pole plate 24 and elastic slice
25。
Further, for step S104 and step S105, field-effect tube 40 is installed on each circuit board 30, with
And protection cap 50 is installed on each circuit board 30, comprising: the print solder paste on circuit board 30, and pass through surface mount process
(SMT, Surface Mounted Technology) installs field-effect tube 40 and protection cap 50.It is mounted on circuit board 30 first
Field-effect tube 40 mounts protection cap 50 again later on circuit board 30, the cover of field-effect tube 40 is buckled in the cavity of protection cap 50.
In addition, further, shell group plate 60 includes cylindrical sidewall group plate 62 and bottom plate group plate 63.Step S103 is come
It says, circuit board group plate 61 is pressed together on shell group plate 60, comprising:
Gasket 14 is respectively set at the both ends of each cylindrical sidewall 12 of cylindrical sidewall group plate 62；
Circuit board group plate 61 and bottom plate group plate 63 are pressed together on to the both ends of cylindrical sidewall group plate 62, and squeeze corresponding position respectively
Set the gasket 14 at place.
In conclusion technical solution provided by the embodiment of the utility model, it is transaudient can to increase electret by protection cap 50
The back cavity of device, and field-effect tube 40 is protected so that electret microphone can in lower frequency range into
The response of row flat frequency.In addition, circuit board 30 is closed by process for pressing lid in shell 10 in the utility model embodiment
Opening passes through the scheme phase that is sealed the gap between circuit board 30 and shell 10 with glue after laser spot welding with the prior art
Than, the assembling cost of electret microphone can be greatly reduced by process for pressing, and technology difficulty is small, it is easily operated.
It should be noted that, although specific embodiment of the present utility model is described in detail in conjunction with attached drawing,
But it should not be construed as the restriction to the protection scope of the utility model.In range described by claims, this field skill
The various modifications and deformation that art personnel can make without creative work still fall within the protection scope of the utility model.
The example of the utility model embodiment is intended to concisely illustrate the technical characterstic of the utility model embodiment, so that this
Field technical staff can intuitively understand the technical characterstic of the utility model embodiment, be not intended as the utility model embodiment
Improper restriction.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be.Those of ordinary skill in the art are not the case where paying creative labor
Under, it can it understands and implements.
Several preferred embodiments of the utility model embodiment have shown and described in above description, but as previously mentioned, should
Understand that the utility model embodiment is not limited to forms disclosed herein, should not be regarded as an exclusion of other examples,
And can be used for other combinations, modifications, and environments, and can in application contemplated scope described herein, by above-mentioned introduction or
The technology or knowledge of related fields are modified.And changes and modifications made by those skilled in the art do not depart from the utility model reality
Apply the spirit and scope of example, then it all should be in the protection scope of the utility model embodiment appended claims.
Claims (6)
1. a kind of electret microphone, which is characterized in that including shell, vibration component, circuit board, field-effect tube and protection
Lid；Wherein,
The shell is tubular structure open at one end, and one end opposite with the opening is provided with the first sound hole；
The vibration component is arranged in the interior of shell, and is electrically connected with the circuit board；
The circuit board cover is closed over said opening；
The field-effect tube is located at the shell exterior, and is electrically connected with the circuit board；
The protection cap is connect with the circuit board, and the field-effect shroud is buckled in the cavity of the protection cap；It is described
Through-hole is provided on circuit board, the through-hole is located at the protection housing and buckles in space.
2. electret microphone according to claim 1, which is characterized in that the making material of the protection cap is metal.
3. electret microphone according to claim 1, which is characterized in that the vibration component includes being sequentially placed and sealing
Mounted in the washer of the interior of shell, vibrating diaphragm, gasket, pole plate and elastic slice；
The edge of the pole plate is equipped with multiple equally distributed notches, passes through the elastic slice between the pole plate and the circuit board
Electrical connection, wherein the circuit board is equipped with the electrode being electrically connected with the elastic slice.
4. electret microphone according to claim 3, which is characterized in that the elastic slice includes two segmental arcs and two
Flat segments, the segmental arc and flat segments interval first place connect；
The segmental arc is provided with salient point on the segmental arc towards the circuit board protrusion,
The arc engaging lug towards the circuit board protrusion is provided in the flat segments；
The electrical connection of the salient point and the arc engaging lug and the circuit board, the flat segments are connect with the pole plate.
5. electret microphone according to any one of claim 1 to 4, which is characterized in that the shell includes tubular
Side wall and bottom plate；
The circuit board and the bottom plate cover conjunction at the both ends of the cylindrical sidewall respectively, the cylindrical sidewall and the bottom plate it
Between and the cylindrical sidewall and the circuit board between be provided with gasket；
The first sound hole setting is covered with the damping for covering first sound hole on the bottom plate, and on the bottom plate
Cloth.
6. electret microphone according to any one of claim 1 to 4, which is characterized in that the pole plate is equipped with the
Two sound holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821899454.7U CN209017314U (en) | 2018-11-16 | 2018-11-16 | A kind of electret microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821899454.7U CN209017314U (en) | 2018-11-16 | 2018-11-16 | A kind of electret microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209017314U true CN209017314U (en) | 2019-06-21 |
Family
ID=66842660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821899454.7U Withdrawn - After Issue CN209017314U (en) | 2018-11-16 | 2018-11-16 | A kind of electret microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209017314U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451410A (en) * | 2018-11-16 | 2019-03-08 | 歌尔股份有限公司 | A kind of electret microphone and production method |
-
2018
- 2018-11-16 CN CN201821899454.7U patent/CN209017314U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451410A (en) * | 2018-11-16 | 2019-03-08 | 歌尔股份有限公司 | A kind of electret microphone and production method |
| CN109451410B (en) * | 2018-11-16 | 2024-01-16 | 潍坊歌尔微电子有限公司 | Electret microphone and manufacturing method |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200615 Address after: 261031 building 10, Geer phase II Industrial Park, No. 102, Ronghua Road, Ronghua community, Xincheng street, high tech Zone, Weifang City, Shandong Province Patentee after: Weifang goer Microelectronics Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, Weifang hi tech Industrial Development Zone, Shandong, Weifang Patentee before: GOERTEK Inc. |
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Granted publication date: 20190621 Effective date of abandoning: 20240116 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190621 Effective date of abandoning: 20240116 |