CN110811968B - Front-stacking type condom and forming method - Google Patents
Front-stacking type condom and forming method Download PDFInfo
- Publication number
- CN110811968B CN110811968B CN201911168206.4A CN201911168206A CN110811968B CN 110811968 B CN110811968 B CN 110811968B CN 201911168206 A CN201911168206 A CN 201911168206A CN 110811968 B CN110811968 B CN 110811968B
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- Prior art keywords
- sleeve
- inner sleeve
- outer sleeve
- condom
- glans
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 210000003899 penis Anatomy 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims description 10
- 210000001124 body fluid Anatomy 0.000 claims description 6
- 239000010839 body fluid Substances 0.000 claims description 6
- 210000003195 fascia Anatomy 0.000 description 11
- 239000010410 layer Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 208000015181 infectious disease Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000001568 sexual effect Effects 0.000 description 2
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003433 contraceptive agent Substances 0.000 description 1
- 230000002254 contraceptive effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 210000001625 seminal vesicle Anatomy 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 201000010653 vesiculitis Diseases 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F6/00—Contraceptive devices; Pessaries; Applicators therefor
- A61F6/02—Contraceptive devices; Pessaries; Applicators therefor for use by males
- A61F6/04—Condoms, sheaths or the like, e.g. combined with devices protecting against contagion
Landscapes
- Health & Medical Sciences (AREA)
- Reproductive Health (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Abstract
The invention discloses a front-stacking type condom, which is characterized in that the front end of an inner sleeve is closed, a semi-permeable cut is arranged at the closed position, air is exhausted between the inner sleeve and an outer sleeve, the front section of the outer sleeve is stacked at the closed position of the front port of the inner sleeve, the inner sleeve is rolled up along with the outer sleeve for forming, when in use, the forming roll is released to exceed a glans penis, the outer sleeve and the inner sleeve are lifted, the glans pushes against the front end of the inner sleeve and tears the semi-permeable cut, so that the glans can extrude through a tearing opening, and the tearing opening is tightly hooped on a penis at the rear part of the glans; the front section of the sleeve is stacked at the front end of the inner sleeve by virtue of vacuum, the sleeve is easy to curl and store, the process is simple, when the condom is used, the condom is released, formed and rolled to exceed the glans, the outer sleeve and the inner sleeve are lifted, the inner sleeve is stretched and stretched under the top of the glans, the glans pushes the tearing opening towards the top of the front end of the inner sleeve and tears the semi-transparent cut, so that the glans is squeezed through the tearing opening, and the tearing opening is tightly hooped on the penis at the rear part of the glans.
Description
Technical Field
The invention relates to a condom, in particular to a front-stacking condom and a forming method thereof, which are applied to the fields of family planning, preventive approach disease infection and the like.
Background
The condom is an effective contraceptive tool in the sexual life of people, and can prevent disease infection caused by cross body fluid in the sexual life. The existing condom is mostly in a single-layer cylindrical shape, body fluid is easy to leak and cross, so the invention of application number 201580042092.2 appears, the condom is provided with an inner sleeve, the body fluid can be effectively prevented from leaking and crossing, but the inner sleeve is not easy to turn over to the inner side when being used after being packaged and curled, and the proposed outer sleeve stacking type curling mode is complex, high in cost and not easy to popularize generally.
Disclosure of Invention
In order to solve the problems, the invention provides a front-stacking condom and a forming method.
The technical scheme adopted by the invention is as follows: a front-stacking type condom comprises an outer sleeve with a sealed front end, wherein a glans penis accommodating space is arranged at the sealed position of the front end of the outer sleeve, an inner sleeve is arranged in the outer sleeve, a body fluid accommodating space is formed between the inner sleeve and the outer sleeve, the length of the inner sleeve is smaller than that of the outer sleeve, the rear end of the inner sleeve is opened and connected with the outer sleeve, the front end of the inner sleeve is sealed and provided with a semi-transparent cut, air is exhausted between the inner sleeve and the outer sleeve, the front section of the outer sleeve is stacked at the sealed position of the front port of the inner sleeve, the inner sleeve is rolled and formed along with the outer sleeve, when the condom is used, a formed roll is released to exceed the glans penis, the outer sleeve and the inner sleeve are lifted, the glans penis is jacked towards the front end of the inner sleeve, the semi-transparent cut is torn, so that the glans penis is squeezed through a tearing port, and the glans penis is tightly hooped at the rear part of the glans penis.
Furthermore, the thickness of the upper half-through cut at the closed position of the front end opening of the inner sleeve is larger than that of the sleeve body of the inner sleeve or the front end of the outer sleeve.
The front stack condom of claim 1, wherein said semi-permeable slit is located inside or outside or on both sides of the front end closure of the inner sheath.
Furthermore, the semi-permeable incision is composed of a cut-through opening at the closed position of the front end of the inner sleeve and a membrane covering and attached to the cut-through opening
Furthermore, at least one section of the inner sleeve is provided with ribs and/or membranes.
Further, the ribs and/or membrane distribute the sleeve forward section.
Furthermore, the ribs and/or the membranes are distributed on the inner sleeve in a segmented mode along the axial direction of the inner sleeve.
Further, the ribs and/or the membranes are circumferentially distributed on the inner sleeve at intervals.
A forming method for a front-stacking condom is provided with an internal supporting die and is characterized by comprising the following steps: the inner sleeve and the outer sleeve are sleeved on the inner support die in sequence, air between the inner sleeve and the outer sleeve is pumped out from the rear end, the front section of the outer sleeve is stacked at the closed position of the front end port of the inner sleeve, the inner sleeve is connected with the rear end of the outer sleeve in an aligned mode, and the inner sleeve is rolled up along with the outer sleeve to be formed.
A forming method for a front-stacking condom is provided with an internal supporting die and is characterized by comprising the following steps: the inner sleeve and the outer sleeve are sleeved on the inner support die in sequence, the front end of the outer sleeve is extruded to exhaust gas between the inner sleeve and the outer sleeve, the front section of the outer sleeve is stacked at the closed position of the front end port of the inner sleeve, the rear ends of the inner sleeve and the outer sleeve are connected in alignment, and the inner sleeve is rolled up along with the outer sleeve to be formed.
Furthermore, when the front end of the outer sleeve is extruded, air is exhausted from the rear end to exhaust air between the inner sleeve and the outer sleeve.
A forming method for the front-stacking condom is provided with an internal supporting die and then the following steps are carried out: the inner sleeve and the outer sleeve are sleeved on the inner supporting die in sequence, the inner supporting die is placed in a vacuum chamber before or after the inner sleeve and the outer sleeve are sleeved, the front section of the outer sleeve is stacked at the closed position of the front port of the inner sleeve, and the inner sleeve is rolled up along with the outer sleeve for forming.
The front pile type condom obtained by the forming method of the invention has the advantages that the front section of the outer sleeve is stacked at the front end of the inner sleeve by virtue of vacuum, the curling and the storage are easy, the process is simple, when in use, the front section of the outer sleeve is released, formed and rolled to exceed the glans, the outer sleeve and the inner sleeve are lifted, the inner sleeve is stretched and stretched under the top of the glans, the glans pushes the glans through the tearing opening by pushing the half-transparent cut to the top of the front end of the inner sleeve, and the tearing opening is tightly hooped on the penis at the rear part of the glans.
Drawings
Fig. 1 is a schematic view of the structure of a partial condom body with a semi-permeable cut distributed in a circular ring in an un-exhausted rolled state.
Fig. 2 is a schematic view of the structure of a cross-shaped semi-permeable incision condom part in an un-exhausted rolling state.
Number designation in the figure: 1, coating a jacket; 2, inner sleeve; 3 semi-permeable incision.
Detailed Description
For better understanding of the present invention, the technical solution of the present invention is described by way of examples with reference to the accompanying drawings, wherein the same components and configurations in each embodiment are described in the previous examples, and the following examples are not intended to be missing technical features.
In the first embodiment, as shown in fig. 1, the front-stacking condom comprises an outer sleeve 1 with a closed front end, wherein the closed front end of the outer sleeve is a glans penis accommodating space, the outer sleeve can be arranged as required when a seminal vesicle is not arranged, an inner sleeve 2 is arranged in the outer sleeve, a body fluid accommodating space is formed between the inner sleeve and the outer sleeve, the length of the inner sleeve is smaller than that of the outer sleeve, the rear end of the inner sleeve is connected with the outer sleeve in an open mode, and the front end of the inner sleeve is closed and is provided with a semi-permeable cut 3, air is exhausted between the inner sleeve and the outer sleeve, the front section of the outer sleeve is stacked at the closed front end of the inner sleeve, the inner sleeve is rolled and formed with the outer sleeve and is placed in a package, when the condom is used, the front end of the inner sleeve is aligned with the glans penis, the outer sleeve and the inner sleeve are pulled after the formed roll exceeds the glans penis, the glans penis is propped against the front end of the inner sleeve, the semi-permeable cut is torn to enable the glans penis to extrude the glans penis, and the tear opening to be tightly hooped on a penis at the rear part of the glans penis.
The front-stacking type condom has the advantages that the front section of the outer sleeve is stacked at the front end of the inner sleeve by virtue of vacuum, the front section of the outer sleeve is rolled to the front end of the inner sleeve, the curling and the storage are easy, the process is simple, when the front-stacking type condom is used, the front section of the outer sleeve is released to form a roll, the outer sleeve and the inner sleeve are lifted after the roll exceeds the glans, the inner sleeve is stretched and extended under the top of the glans, the glans pushes the glans through the tearing opening by tearing the semi-transparent cut towards the top of the front end of the inner sleeve, the tearing opening is tightly hooped on the penis at the rear part of the glans, and the problem that the inner sleeve cannot be turned to the inner side does not exist.
In the embodiment, the semi-permeable cuts are distributed at equal intervals along the circumferential direction of a ring boundary, the cuts are semi-permeable cuts which are not cut through and are not breathable at ordinary times, the semi-permeable cuts are positioned at the inner side of the closed part at the front end of the inner sleeve and can also be arranged at the outer side or two sides during implementation, interlayer gas is discharged before the inner sleeve is curled, no gas enters each layer after the inner sleeve is attached to the outer sleeve, when the semi-permeable cuts are torn by pulling stress during use, then partial tearing openings are communicated by tearing along the tearing openings, the closed part is opened to enable glans to extrude through the tearing parts, the semi-permeable cuts can be distributed continuously around without being distributed at intervals, and the tearing is continuously carried out to push the closed part; during implementation, fluctuation along the axial direction of the inner sleeve can be added into the semi-permeable incision track, so that the front port of the inner sleeve has a waveform edge, and the shape stability and tearing are facilitated; the semi-permeable incision can be intersected with the semi-permeable incision to guide the tearing direction at the closed position; when the method is implemented, the thickness of the semi-permeable cut on the closed part of the front port of the inner sleeve is larger than that of the sleeve body of the inner sleeve or the front end of the outer sleeve, so that the semi-permeable cut is conveniently cut, the strength of the port formed after tearing is enhanced, and the thickened part can be coated with several layers of glue solution in a dip mode or can be covered and combined later; the semi-permeable incision can be a closed part at the front end of the inner sleeve, and then the inner side or the outer side of the semi-permeable incision is covered with the attached membrane to form a semi-permeable opening. The semi-permeable cuts are not limited to be distributed along a circle, and are not limited to be torn to form a round hole, as long as the cuts can allow the glans to extrude through and be hooped on the penis at the back of the glans, and the cuts can also be one or more crossed cuts as shown in fig. 2.
In order to enable the axial stretching and contracting amplitude of the inner sleeve to be smaller, the glans can be torn and extruded into a port formed in a tearing type through a small stroke, at least one section of rib and/or film can be arranged on the inner sleeve, the elasticity of the fascia part is smaller than that of the fascia part, the stretching resistance of the fascia part is increased, the stretching and stretching amplitude of the fascia part on the inner layer is smaller than that of the outer sleeve when the inner layer and the outer layer are synchronously pulled, the rib and/or the film can be distributed on the front section of the sleeve, or the front section adjacent to the inward contracting section of the front port of the inner sleeve, or the fascia part is distributed on the inner sleeve along the axial direction of the inner sleeve in a segmented manner, as long as the stretching amplitude can be reduced to help the glans to extrude the front port, and the number and the axial position distribution of the fascia axial section can be more set as required; the fascia can be provided with ribs or films independently or in combination, the ribs or films can be made of the same material as the inner sleeve or different materials, can be integrally formed with the inner sleeve, can be formed by later combination, and can also be formed by chemical means on the basis of the integral formation of the inner sleeve to enable the position of the inner sleeve to be chemically changed to form the fascia with smaller elasticity; except for the annular arrangement of the fascia part, in order to enable the fascia part to have larger axial tensile resistance and good radial deformation tensile elasticity, the fascia is distributed on the inner sleeve at intervals in the circumferential direction, and the interval part can have good elasticity.
A forming method for a front-stacking condom is characterized in that an inner supporting die is preset, and then the following steps are carried out: the inner sleeve and the outer sleeve are sequentially sleeved on the inner support die and tend not to stretch, so that the rear sections of the outer sleeve and the inner sleeve which are equal in length are aligned with the inner sleeve, then gas between the inner sleeve and the outer sleeve is pumped out from the rear end to form vacuum, the front section of the outer sleeve is stacked at the closed position of the front port of the inner sleeve, the rear ends of the inner sleeve and the outer sleeve are aligned and connected, and the inner sleeve is rolled up along with the outer sleeve to be formed.
A forming method for a front-stacking condom is characterized in that an inner supporting die is preset, and then the following steps are carried out: the inner sleeve and the outer sleeve are sequentially sleeved on the inner support die and tend not to stretch, so that the rear sections of the outer sleeve and the inner sleeve which are equal in length are aligned with the inner sleeve, the front end of the outer sleeve is extruded to exhaust gas between the inner sleeve and the outer sleeve, a vacuum is formed to stack the front section of the outer sleeve at the closed position of the front end of the inner sleeve, the rear ends of the inner sleeve and the outer sleeve are connected in alignment, and the inner sleeve is rolled up along with the outer sleeve to be formed.
A forming method for a front-stacking condom is characterized in that an inner supporting die is preset, and then the following steps are carried out: the inner sleeve and the outer sleeve are sequentially sleeved on the inner support die and tend not to stretch, the rear sections of the outer sleeve and the inner sleeve which are equal in length are aligned with the inner sleeve, the inner support die is arranged in a vacuum chamber before or after the inner sleeve and the outer sleeve are sleeved, the front section of the outer sleeve is stacked at the closed position of the front end of the inner sleeve, the rear ends of the inner sleeve and the outer sleeve are aligned and connected, the inner sleeve is rolled up along with the outer sleeve to be formed, and then the inner sleeve is removed from the vacuum chamber.
The connection between the inner sleeve and the outer sleeve can be realized by bonding or rolling, or the bonded outer sleeve is provided with vent holes at the rear section and then bonded with the vent holes for sealing
In the implementation process, the front end of the outer sleeve can be extruded, and meanwhile, the rear end can be used for exhausting air between the inner sleeve and the outer sleeve, so that vacuum stacking is completed cooperatively.
In practice, the circumferential total width of each fascial portion is preferably 20 to 60 percent, more preferably 30 to 40 percent.
In summary, the embodiments of the present invention are merely some specific examples within the technical scope of the present invention, and in implementation, the technical features may be re-split and combined to form more implementation approaches.
Equivalent modifications and additions to the prior art can be made without departing from the inventive concept as defined in the present application.
Claims (10)
1. A front-stacking type condom comprises an outer sleeve with a sealed front end, wherein a glans penis accommodating space is arranged at the sealed position of the front end of the outer sleeve, an inner sleeve is arranged in the outer sleeve, a body fluid accommodating space is formed between the inner sleeve and the outer sleeve, the length of the inner sleeve is smaller than that of the outer sleeve, the rear end of the inner sleeve is open and connected with the outer sleeve, the front end of the inner sleeve is sealed and provided with a semi-transparent cut, air is exhausted between the inner sleeve and the outer sleeve, the front section of the outer sleeve is stacked at the sealed position of the front port of the inner sleeve in a vacuum mode, the inner sleeve is rolled and formed along with the outer sleeve, when the condom is used, a formed roll is released to exceed the glans penis, the outer sleeve and the inner sleeve are pulled, the inner sleeve is stretched and stretched under the glans penis, the glans are jacked towards the front end of the inner sleeve, the semi-transparent cut is torn, so that the glans penis penetrates through a tearing port, and the tearing port is tightly hooped on the penis at the rear part of the glans penis.
2. The front stack condom of claim 1, wherein the front thickness of the upper half-cut at the closed position of the front end of the inner sheath is larger than the front end of the inner sheath body or the outer sheath body.
3. The front stack condom of claim 1, wherein the semi-permeable cut-out is located inside or outside the front closure of the inner sheath.
4. The front stack type condom of claim 1, wherein the semi-permeable cut is composed of a cut-through opening at the closed position of the front end of the inner sleeve and a membrane covering and attached on the cut-through opening.
5. A front stack condom according to any one of claims 1 to 4, in which at least one section of the condom is provided with ribs and/or membranes.
6. The front stack condom of claim 5, wherein said ribs and/or membranes are distributed on said inner sheath along axial segments of said inner sheath.
7. The front stack condom of claim 5, wherein said ribs and/or membranes are circumferentially spaced on the inner sheath.
8. A method of forming a front-stacking condom according to claim 1, provided with an internal bracing die, comprising the steps of: the inner sleeve and the outer sleeve are sleeved on the inner support die in sequence, air between the inner sleeve and the outer sleeve is pumped out from the rear end, the front section of the outer sleeve is stacked at the closed position of the front end port of the inner sleeve, the inner sleeve is connected with the rear end of the outer sleeve in an aligned mode, and the inner sleeve is rolled up along with the outer sleeve to be formed.
9. A method of forming a front-stacking condom according to claim 1, provided with an internal bracing die, comprising the steps of: the inner sleeve and the outer sleeve are sleeved on the inner support die in sequence, the front end of the outer sleeve is extruded to exhaust gas between the inner sleeve and the outer sleeve, the front section of the outer sleeve is stacked at the closed position of the front end port of the inner sleeve, the rear ends of the inner sleeve and the outer sleeve are connected in alignment, and the inner sleeve is rolled up along with the outer sleeve to be formed.
10. A method of forming a front-stacking condom according to claim 1, provided with an internal bracing die, and then carrying out the steps of: the inner sleeve and the outer sleeve are sleeved on the inner supporting die in sequence, the inner supporting die is placed in a vacuum chamber before or after the inner sleeve and the outer sleeve are sleeved, the front section of the outer sleeve is stacked at the closed position of the front port of the inner sleeve, and the inner sleeve is rolled up along with the outer sleeve for forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168206.4A CN110811968B (en) | 2019-11-25 | 2019-11-25 | Front-stacking type condom and forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168206.4A CN110811968B (en) | 2019-11-25 | 2019-11-25 | Front-stacking type condom and forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110811968A CN110811968A (en) | 2020-02-21 |
| CN110811968B true CN110811968B (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911168206.4A Active CN110811968B (en) | 2019-11-25 | 2019-11-25 | Front-stacking type condom and forming method |
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| CN (1) | CN110811968B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6035854A (en) * | 1999-04-20 | 2000-03-14 | Blake; Rory P. | Abbreviated condom with cleft wedge |
| CN201414865Y (en) * | 2009-03-21 | 2010-03-03 | 陈斌 | Leak-proof condom |
| CN104382684A (en) * | 2014-08-29 | 2015-03-04 | 蔡畅 | Tool for preventing fertilization and diseases |
| CN106420150A (en) * | 2016-12-12 | 2017-02-22 | 衡阳县海得利网络技术有限公司 | Double-layer hole-leakage-preventing condom |
| CN108784913A (en) * | 2018-04-12 | 2018-11-13 | 舒思明 | A kind of Balaus condon |
| CN106659583B (en) * | 2015-07-05 | 2019-08-23 | 大庆元子科技开发有限公司 | Preventing humor safe cross set and its tool of production |
-
2019
- 2019-11-25 CN CN201911168206.4A patent/CN110811968B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6035854A (en) * | 1999-04-20 | 2000-03-14 | Blake; Rory P. | Abbreviated condom with cleft wedge |
| CN201414865Y (en) * | 2009-03-21 | 2010-03-03 | 陈斌 | Leak-proof condom |
| CN104382684A (en) * | 2014-08-29 | 2015-03-04 | 蔡畅 | Tool for preventing fertilization and diseases |
| CN106659583B (en) * | 2015-07-05 | 2019-08-23 | 大庆元子科技开发有限公司 | Preventing humor safe cross set and its tool of production |
| CN110279510A (en) * | 2015-07-05 | 2019-09-27 | 大庆元子科技开发有限公司 | A kind of condom |
| CN110338962A (en) * | 2015-07-05 | 2019-10-18 | 大庆元子科技开发有限公司 | A kind of preventing humor safe cross set |
| CN110368174A (en) * | 2015-07-05 | 2019-10-25 | 大庆元子科技开发有限公司 | A kind of anti-safe cross set |
| CN106420150A (en) * | 2016-12-12 | 2017-02-22 | 衡阳县海得利网络技术有限公司 | Double-layer hole-leakage-preventing condom |
| CN108784913A (en) * | 2018-04-12 | 2018-11-13 | 舒思明 | A kind of Balaus condon |
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|---|---|
| CN110811968A (en) | 2020-02-21 |
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Effective date of registration: 20231013 Address after: Room B1-301-16, No. 198 Qidi Road, Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province, 310012 Patentee after: Zhejiang Private Excitation Biotechnology Co.,Ltd. Address before: 163711 b7-1302, Hancheng Xingyuan, Longfeng District, Daqing City, Heilongjiang Province Patentee before: DAQING YUANZI TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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