CN111260528A - Real estate information verification method based on asymmetric algorithm - Google Patents
Real estate information verification method based on asymmetric algorithm Download PDFInfo
- Publication number
- CN111260528A CN111260528A CN202010082831.3A CN202010082831A CN111260528A CN 111260528 A CN111260528 A CN 111260528A CN 202010082831 A CN202010082831 A CN 202010082831A CN 111260528 A CN111260528 A CN 111260528A
- Authority
- CN
- China
- Prior art keywords
- real estate
- information
- data
- algorithm
- certificate
- 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.)
- Granted
Links
- 238000012795 verification Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000008520 organization Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 3
- 238000010200 validation analysis Methods 0.000 claims description 3
- 230000006855 networking Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/10—Services
- G06Q50/26—Government or public services
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/953—Querying, e.g. by the use of web search engines
- G06F16/9535—Search customisation based on user profiles and personalisation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
Abstract
The invention discloses a real estate information verification method based on an asymmetric algorithm, belongs to the field of information security, and applies a data signature concept to ensure that the effects of non-tampering, non-repudiation and non-destructible integrity of real estate key data can be realized after the real estate key data are protected. The verification program is convenient and fast, the authenticity of the real estate information can be verified without networking after any smart phone is installed with an APP, the efficiency of real estate related services is effectively improved, and the trust cost of interest related parties is reduced.
Description
Technical Field
The invention relates to a real estate information verification method based on an asymmetric algorithm, and belongs to the technical field of information.
Background
Real property (immovable property) refers to property that is not movable according to natural properties or legal regulations, such as land deposits, houses, mine prospects, mining rights, etc., land products that have not been separated from the land, and other objects that are attached to the land by nature or manpower and cannot be separated. With the calculation of the urbanization process, the foreign population of the big city is higher and higher, and the real estate transaction is more and more frequent.
With economic development, the real estate industry has also been rapidly developed, the real estate industry is mainly used for functions of selling, transferring, evaluating and the like of real estate, in the process of selling, transferring and evaluating the real estate, verification of real estate information is particularly important, and the verification of the real estate information is used for monitoring the process of selling or evaluating the real estate information and the real estate so as to prevent illegal phenomena in the real estate industry.
In the existing real estate information verification process, a user needs to manually verify information, store the information and screen the information, so that the existing real estate information verification process is complicated and time-consuming, the verification error rate is high due to manual verification, and the accuracy of real estate information verification is reduced.
Although national networking is realized on the national unified real estate registration information management basic platform at present, and a real estate registration system enters a comprehensive operation stage, the reality, accuracy, completeness and consistency of real estate information cannot be effectively guaranteed. The asymmetric encryption technology is combined with the real estate information authenticity verification requirement, a real estate retrieval and authenticity verification platform is established, the whole life cycle of real estate registration data can be checked, controllable and verifiable, and the method becomes a feasible way for solving the problems.
At present, most local government real estate management departments realize the functions of acquiring named real estate data and printing and stamping seals on a special inquiry terminal. However, since the query result is completely a plaintext display, it is impossible to prevent the query result from being used for illegal purposes after being tampered on the basis, and rights-related persons do not have a convenient and fast method to check the authenticity of real estate data directly, which affects the efficiency of services such as real estate buying and selling, mortgage and the like. On the premise of not damaging the original retrieval process, the method and the system use a publicly replaceable encryption algorithm and utilize basic facilities such as a CA center and the like to realize the quick retrieval and authenticity verification of the real estate information.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a real estate information verification method based on an asymmetric algorithm, and the specific scheme is as follows:
a real estate information verification method based on an asymmetric algorithm comprises two parts, namely information retrieval and information retrieval result verification, wherein the information retrieval method comprises the following steps:
step S1: the real estate information management department submits necessary information to a certificate management organization, and applies for a certificate and corresponding private key information;
step S2: the real estate inquirer logs in by using an inquiry terminal, and sends inquiry request information to the real estate information management server for inquiry after the identity information of the real estate inquirer passes verification; wherein the query request information includes: request time, request type, applicant name, applicant identity information number and terminal information;
step S3: the real estate information management server firstly checks the authenticity of the identity information of the inquirer, namely whether the identity certificate number is matched with the name or not, then retrieves the corresponding real estate data according to the inquirer information, if no corresponding data exists, a prompt is given and the real estate data is directly returned, otherwise, the step S4 is executed;
step S4: the real estate information management server generates data A by the retrieved real estate data together with other necessary information and performs digest algorithm operation to obtain a digest value B1, and performs signature algorithm operation processing on the digest value B1 by using the private key obtained in the step S1 to obtain a signature value C;
step S5: the real estate information management server returns the data a and the signature value C in step S4 to the terminal in the form of two-dimensional code data, the terminal prints the data, and the inquirer search process is ended.
The real estate information retrieval process does not depend on a specific certificate authority or an asymmetric algorithm.
The digest algorithm and the signature algorithm in step S4 are also replaceable and not unique, the operation process may be performed by using a software algorithm or using hardware, and one of the key points of the important protection is the private key in step S1.
In the present application, the digest algorithm uses a hashing algorithm, which is MD5 algorithm or SHA-1 algorithm. The signature uses the RSA algorithm of 1024 bits.
One of the important points of the process is the combination of the asymmetric algorithm with real estate data and the data calculation and data combination in step S4.
The query result gives consideration to human readability and machine readability, real estate information is printed in a plain text mode and is read by a user, signature information is contained in the two-dimensional code information and is used by a verification program, and the user simply modifies the plain text information or the two-dimensional code to cause that verification cannot pass.
The real estate information retrieval result verification method comprises the following steps:
step A: acquiring a certificate Cert applied by a real estate information management department from a public channel and analyzing the certificate Cert to obtain a public key PK of an asymmetric algorithm;
and B: scanning the two-dimensional code generated in the query step S5 to obtain data A and a signature value C, performing digest operation on the data A by using the same digest algorithm to obtain a digest value B1 in the step S4, and performing decryption operation on the signature value C by using a public key PK to obtain a result B2, wherein if the values of B1 and B2 are equal, the verification is passed, and the data A is real and valid data; if the values of B1 and B2 are not equal, then the validation fails and the real estate retrieval information is in error.
The certificate information is open to the outside, and the private key information is protected in a storage medium; the certificate management organization is a CA management center; the digest algorithm and the signature algorithm in the step S4 are disclosed; the data A includes: inquiring time, inquiring person information, real estate information, terminal information and real estate information management department information; the data a in the step S5 is returned in plaintext form.
The B1 obtained in step B is the same as B1 in the search flow, because the original data a is the same and the digest algorithm is the same.
Aiming at the current situation that the authenticity verification of the existing real estate retrieval data is difficult, the invention provides the asymmetric encryption algorithm to protect the real estate sensitive information, ensure that the real estate information cannot be tampered, and ensure the integrity, authenticity and non-repudiation of the data.
The invention comprises two mutually independent and mutually associated processes, namely a real estate information retrieval part P1 and a real estate information retrieval result verification part P2.
The real estate information comprises natural attribute information and registration attribute information, wherein the natural attributes comprise the area, type, gradient, position and the like of the real estate, and the registration attributes comprise information of authorized persons, administrative regions and ownership. The property data also includes the status of the property.
Advantageous effects
1. The existing user operation flow is fully considered, no extra step is added to a retrieval part on the basis of the existing operation system, and the user operation is completely insensitive.
2. The real feasibility is fully considered, the software and hardware investment of the existing real estate management information system is protected, the matching performance is good, and the extra cost investment is not needed.
3. There is no specific requirement for asymmetric algorithms, and it can be easily replaced with the latest algorithm as cryptography progresses.
4. The verification program is convenient and quick, any intelligent terminal (mobile phone or computer and other equipment) can be used after being installed, the verification can be completed quickly by scanning the two-dimensional code, and the verification can be completed locally even without requiring the networking of the verification program.
5. The verification process is completely open, and any organization can initiate verification without consent of the real estate management department.
6. The verification speed is high, and the accuracy is high. The high speed is because the verification process is carried out completely locally and is not influenced by external factors such as network quality, transmission speed and the like, and under the same condition, the verification speed can be improved by 70-80 percent compared with the network verification method commonly used in the field even if the same hardware equipment is used for testing; the high accuracy is because whether the verification passes or not is determined by the asymmetric cryptographic algorithm, and anyone cannot influence the judgment of the verification result, so the accuracy can reach 100%.
Drawings
FIG. 1 is a P1 flow diagram of the present invention;
FIG. 2 is a P2 flow chart of the present invention.
Detailed Description
Example 1
A real estate information verification method based on an asymmetric algorithm comprises two parts, namely information retrieval and information retrieval result verification, wherein the information retrieval method comprises the following steps:
step S1: the real estate information management department submits necessary information to a certificate management organization, and applies for a certificate and corresponding private key information;
step S2: the real estate inquirer logs in by using an inquiry terminal, and sends inquiry request information to the real estate information management server for inquiry after the identity information of the real estate inquirer passes verification; wherein the query request information includes: request time, request type, applicant name, applicant identity information number and terminal information;
step S3: the real estate information management server firstly checks the authenticity of the identity information of the inquirer, namely whether the identity certificate number is matched with the name or not, then retrieves the corresponding real estate data according to the inquirer information, if no corresponding data exists, a prompt is given and the real estate data is directly returned, otherwise, the step S4 is executed;
step S4: the real estate information management server generates data A by the retrieved real estate data together with other necessary information and performs digest algorithm operation to obtain a digest value B1, and performs signature algorithm operation processing on the digest value B1 by using the private key obtained in the step S1 to obtain a signature value C;
step S5: the real estate information management server returns the data a and the signature value C in step S4 to the terminal in the form of two-dimensional code data, the terminal prints the data, and the inquirer search process is ended.
The real estate information retrieval process does not depend on a specific certificate authority or an asymmetric algorithm.
The digest algorithm and the signature algorithm in step S4 are also replaceable and not unique, the operation process may be performed by using a software algorithm or using hardware, and one of the key points to be protected is the private key in step S1.
The hashing algorithm used by current digest algorithms is the MD5 algorithm or the SHA-1 algorithm.
The signature uses the RSA algorithm of 1024 bits.
The focus of this process is on the combination of asymmetric algorithms with real estate data and the data calculation and data combination in step S4.
The query result gives consideration to human readability and machine readability, real estate information is printed in a plain text mode and is read by a user, signature information is contained in the two-dimensional code information and is used by a verification program, and the user simply modifies the plain text information or the two-dimensional code to cause that verification cannot pass.
The real estate information retrieval result verification method comprises the following steps:
step A: acquiring a certificate Cert applied by a real estate information management department from a public channel and analyzing the certificate Cert to obtain a public key PK of an asymmetric algorithm;
and B: scanning the two-dimensional code generated in the query step S5 to obtain data A and a signature value C, performing digest operation on the data A by using the same digest algorithm to obtain a digest value B1 in the step S4, and performing decryption operation on the signature value C by using a public key PK to obtain a result B2, wherein if the values of B1 and B2 are equal, the verification is passed, and the data A is real and valid data; if the values of B1 and B2 are not equal, then the validation fails and the real estate retrieval information is in error.
The certificate information is open to the outside, and the private key information is protected in a storage medium; the certificate management organization is a CA management center; the digest algorithm and the signature algorithm in the step S4 are disclosed; the data A includes: inquiring time, inquiring person information, real estate information, terminal information and real estate information management department information; the data a in the step S5 is returned in plaintext form.
The B1 obtained in step B is the same as B1 in the search flow, because the original data a is the same and the digest algorithm is the same.
Aiming at the current situation that the authenticity verification of the existing real estate retrieval data is difficult, the invention provides the asymmetric encryption algorithm to protect the real estate sensitive information, ensure that the real estate information cannot be tampered, and ensure the integrity, authenticity and non-repudiation of the data.
The invention comprises two mutually independent and mutually associated processes, namely a real estate information retrieval part P1 and a real estate information retrieval result verification part P2.
The real estate information comprises natural attribute information and registration attribute information, wherein the natural attributes comprise the area, type, gradient, position and the like of the real estate, and the registration attributes comprise information of authorized persons, administrative regions and ownership. The property data also includes the status of the property.
Claims (8)
1. A real estate information verification method based on an asymmetric algorithm is characterized by comprising the following steps:
step S1: the real estate information management department submits necessary information to a certificate management organization and applies for a PKI certificate and corresponding private key information; wherein the necessary information includes: the method comprises the following steps that a main body validity certification document, a certificate application and approval document, a certificate use, a certificate validity period and a private key storage medium of a real estate information management department are stored, wherein the corresponding private key is a private key corresponding to a public key of a PKI (public key infrastructure) certificate;
step S2: the real estate inquirer logs in by using an inquiry terminal, and sends inquiry request information to the real estate information management server for inquiry after the identity information of the real estate inquirer passes verification; wherein the query request information includes: request time, request type, applicant name, applicant identity information number and terminal information;
step S3: the real estate information management server firstly checks the authenticity of the identity information of the inquirer, namely whether the identity certificate number is matched with the name or not, then retrieves the corresponding real estate data according to the inquirer information, if no corresponding data exists, a prompt is given and the real estate data is directly returned, otherwise, the step S4 is executed;
step S4: the real estate information management server generates data A by the retrieved real estate data together with other necessary information and performs digest algorithm operation to obtain a digest value B1, and performs signature algorithm operation processing on the digest value B1 by using the private key obtained in the step S1 to obtain a signature value C; the other necessary information refers to the information content which is self-adjudged by the real estate management department, and the content does not influence the whole process;
step S5: the real estate information management server combines the data A and the signature value C in the step S4 to generate a two-dimensional code data D form, and returns the two-dimensional code data D form to the terminal, the terminal prints the data, the terminal prints the information A described by the natural language, and the two-dimensional code D formed by combining the information A and the signature value C, so that the inquirer retrieval process is finished.
2. The asymmetric algorithm-based real estate information verification method according to claim 1, wherein the real estate search result verification comprises the following steps:
step A: acquiring a certificate Cert applied by a real estate information management department from a public channel and analyzing the certificate Cert to obtain a public key PK of an asymmetric algorithm;
and B: scanning the two-dimensional code generated in the query step S5 to obtain data A and a signature value C, performing digest operation on the data A by using the same digest algorithm as that in the step S4 to obtain a digest value B1 in the step S4, and performing decryption operation on the signature value C by using a public key PK to obtain a result B2, wherein if the values of B1 and B2 are equal, the verification is passed, and the data A is real and valid data; if the values of B1 and B2 are not equal, then the validation fails and the real estate retrieval information is in error.
3. The real estate information verification method based on asymmetric algorithm as claimed in claim 1, characterized in that: the certificate information is open to the outside, and the private key information is protected in a storage medium.
4. The real estate information verification method based on asymmetric algorithm as claimed in claim 1, characterized in that: the certificate management organization is a CA management center.
5. The real estate information verification method based on asymmetric algorithm as claimed in claim 1, characterized in that: the digest algorithm and the signature algorithm in the step S4 are disclosed.
6. The asymmetric algorithm-based real estate information verification method according to claim 1, wherein said data a comprises: the system comprises inquiry time, inquiry person information, real estate information, terminal information and real estate information management department information.
7. The real estate information verification method based on asymmetric algorithm as claimed in claim 1, characterized in that: the data a in the step S5 is returned in plaintext form.
8. The real estate information verification method based on asymmetric algorithm as claimed in claim 2, characterized in that: the B1 obtained in step B is the same as B1 in the search flow, because the original data a is the same and the digest algorithm is the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010082831.3A CN111260528B (en) | 2020-02-07 | 2020-02-07 | Real estate information verification method based on asymmetric algorithm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010082831.3A CN111260528B (en) | 2020-02-07 | 2020-02-07 | Real estate information verification method based on asymmetric algorithm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111260528A true CN111260528A (en) | 2020-06-09 |
| CN111260528B CN111260528B (en) | 2021-09-28 |
Family
ID=70954434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010082831.3A Expired - Fee Related CN111260528B (en) | 2020-02-07 | 2020-02-07 | Real estate information verification method based on asymmetric algorithm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111260528B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281581A (en) * | 2007-09-27 | 2008-10-08 | 北京数字证书认证中心有限公司 | Method for checking whether contents of paper file is distorted or not |
| CN102779263A (en) * | 2012-06-19 | 2012-11-14 | 袁开国 | Credible two-dimensional code scheme based on public key infrastructure (PKI) and digital signature |
| CN105024824A (en) * | 2014-11-05 | 2015-11-04 | 祝国龙 | Method for generating and verifying credible label based on asymmetrical encryption algorithm and system |
| CN107194266A (en) * | 2017-05-12 | 2017-09-22 | 江苏诺安科技有限公司 | It is a kind of to verify the method whether papery license is tampered |
| CN108600272A (en) * | 2018-05-10 | 2018-09-28 | 阿里巴巴集团控股有限公司 | A kind of block chain data processing method, device, processing equipment and system |
| US20190052612A1 (en) * | 2014-01-15 | 2019-02-14 | Blackhawk Network, Inc. | Approach for Message Level Encryption for Service APIs |
| CN109558918A (en) * | 2018-10-10 | 2019-04-02 | 山西特信环宇信息技术有限公司 | A kind of certificate chain real estate electronics license system and its application method |
| CN110084977A (en) * | 2019-04-01 | 2019-08-02 | 武汉市国土资源和规划信息中心 | Self-service query method, system, computer equipment and the storage medium of Immovable Property Registration information |
| CN110417555A (en) * | 2019-06-26 | 2019-11-05 | 珠海横琴新区润成科技股份有限公司 | A kind of safe encryption method and system of personal electric signature |
-
2020
- 2020-02-07 CN CN202010082831.3A patent/CN111260528B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281581A (en) * | 2007-09-27 | 2008-10-08 | 北京数字证书认证中心有限公司 | Method for checking whether contents of paper file is distorted or not |
| CN102779263A (en) * | 2012-06-19 | 2012-11-14 | 袁开国 | Credible two-dimensional code scheme based on public key infrastructure (PKI) and digital signature |
| US20190052612A1 (en) * | 2014-01-15 | 2019-02-14 | Blackhawk Network, Inc. | Approach for Message Level Encryption for Service APIs |
| CN105024824A (en) * | 2014-11-05 | 2015-11-04 | 祝国龙 | Method for generating and verifying credible label based on asymmetrical encryption algorithm and system |
| CN107194266A (en) * | 2017-05-12 | 2017-09-22 | 江苏诺安科技有限公司 | It is a kind of to verify the method whether papery license is tampered |
| CN108600272A (en) * | 2018-05-10 | 2018-09-28 | 阿里巴巴集团控股有限公司 | A kind of block chain data processing method, device, processing equipment and system |
| CN109558918A (en) * | 2018-10-10 | 2019-04-02 | 山西特信环宇信息技术有限公司 | A kind of certificate chain real estate electronics license system and its application method |
| CN110084977A (en) * | 2019-04-01 | 2019-08-02 | 武汉市国土资源和规划信息中心 | Self-service query method, system, computer equipment and the storage medium of Immovable Property Registration information |
| CN110417555A (en) * | 2019-06-26 | 2019-11-05 | 珠海横琴新区润成科技股份有限公司 | A kind of safe encryption method and system of personal electric signature |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111260528B (en) | 2021-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109409122B (en) | File storage method, electronic device and storage medium | |
| CN109417479B (en) | Cryptographic logic rewritable block chains | |
| CN107342867B (en) | Signature verification method and device | |
| US6622247B1 (en) | Method for certifying the authenticity of digital objects by an authentication authority and for certifying their compliance by a testing authority | |
| CN110138733A (en) | Object storage system based on block chain is credible to deposit card and access right control method | |
| CN110771095A (en) | System and method for implementing blockchain-based digital certificates | |
| CN110800254A (en) | System and method for generating digital indicia | |
| PL182163B1 (en) | System for and method of verifying a document | |
| US11849050B1 (en) | Systems and methods of ring usage certificate extension | |
| CN112199721A (en) | Authentication information processing method, device, equipment and storage medium | |
| CN110826091B (en) | File signature method and device, electronic equipment and readable storage medium | |
| CN116582266B (en) | Electronic signature method, electronic signature system, and readable storage medium | |
| CN115208628B (en) | Data integrity verification method based on block chain | |
| CN112131309A (en) | Data evidence storing method and system based on block chain technology | |
| CN112115432A (en) | Block chain based electronic seal credible use system and method | |
| US20180268380A1 (en) | System and method for electronic deposit and authentication of original electronic information objects | |
| CN113849797A (en) | Method, device, equipment and storage medium for repairing data security vulnerability | |
| CN108540447A (en) | A kind of certification authentication method and system based on block chain | |
| CN112751823A (en) | Outgoing data generation method, outgoing safety control method and system | |
| CN103647650A (en) | Rule definition based automatic signature/signature verification device and method | |
| CN107294706A (en) | It is a kind of to support the endorsement method of long-term checking signature, sign server and system | |
| CN111260528B (en) | Real estate information verification method based on asymmetric algorithm | |
| CN114172663B (en) | Business right determining method and device based on block chain, storage medium and electronic equipment | |
| CN113536372B (en) | Data processing method and device and electronic equipment | |
| CN115225346A (en) | Data deposit system for credit investigation big data field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210928 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |