Are you an innovative company that values the protection and defence of its intellectual property? Industrial property rights, i.e., the protection of brands, designs and technical developments, is an important tool in modern company management!

About Us

We, the patent attorneys Hohendorf Kierdorf, support you in the strategic development and defence of your intellectual property. A property rights strategy helps you to assert and defend your position in the market and thereby create company assets ​​that pay off.

Carsten Hohendorf

Graduated as Dipl.-Ing. (Communication and Computer Science) at University of Duisburg-Essen.
German Patent and Trademark Attorney since 2010.
European Patent and Trademark Attorney since 2010.
Member of the Examination Committee for the European Qualification Examination (EQE).

Theodor Kierdorf, LL.M

Graduated as Dipl.-Ing. (mining engineering) at RWTH Aachen.
German Patent and Trademark Attorney since 1994.
European Patent and Trademark Attorney since 1995.
Post Graduate Degree (LL.M ) “European Intellectual Property”
Member of the Examination Committee for the European Qualification Examination (EQE).

International Collaboration

Always devoted to a worldwide perspective, we work side-by-side with the Italien IP boutique "Autuori & Partners" to build up a unique international IP strategy for our clients.


We offer you qualified and competent advice in all matters of intellectual property law.


Medium-sized and privately managed companies, Start-ups and in-house patent departments.


We take a holistic consulting approach and prioritize the interests of our clients. Contact us at any time.


Teamwork with a digitally supported infrastructure. No hierarchies. We are responsive to your individual needs.


Strategy and portfolio advice for patents and trademarks. Patent and trademark litigation. Due diligence opinions and FTO Analysis.


No incomprehensible jargon. Consultancy that caters to you.


Foreseeable and fair charges.

Contact (Main Office)

Hohendorf Kierdorf Patentanwälte PartGmbB

Hohenzollernring 79-83 (Capitol)

50672 Köln

fon: +49 221 42357744

fax: +49 221 42357745


Contact (Branch Office)

Hohendorf Kierdorf Patentanwälte PartGmbB

Am Teppershof 7

46117 Oberhausen

fon: +49 208 74111215

Privacy Statement:

Usage of the website:

When the website is called up, the browser used on the end device automatically sends information to the website server. This information is temporarily stored in a so-called log file. The following information is recorded and stored until it is automatically deleted: IP address of the accessing computer, date and time of access, coordinated universal time (UTC) or Central European Time (CET) and time zone difference to Greenwich Mean Time (GMT), name and URL of the accessed file (specific page), access status / HTTP status code, amount of data transferred, website from which access is made (referrer URL), browser used and, if applicable, the operating system of the computer and the name of the access provider Language and version of the browser software. The data processing takes place to enable a smooth connection to the website, the functioning of the website, analysis of system security and stability, as well as for administrative purposes. This data is stored for security reasons, in particular to prevent attempts to attack the web server. After 80 days at the latest, the data will be anonymized, so that it is no longer possible to establish a reference to individual users, and deleted after statistical processing at the latest. Data that was logged when accessing the website will only be transmitted to third parties if the site operators are required to do so by law or by court order or if disclosure is required for legal or criminal prosecution in the event of attacks on the Internet infrastructure. It will not be passed on for other non-commercial or commercial purposes. The data is processed exclusively for these purposes and in anonymous form for statistical analysis.

Active components

Javascript may be used in the content. This function can be switched off in internet browser settings.

Data processing for contact establishment

When users contact us, the data provided by the users is collected and processed. The data processing for the purpose of establishing contact is based on user consent.

Transfer of data

A transfer of personal data to third parties only takes place if the transfer is necessary to perform the legal requirements of the site operators or to assert, exercise or defend legal claims or if there is a legal obligation or if this is legally permissible and necessary for the execution of contractual relationships or a declaration of consent has been issued.

Rights of Data Subjects

Within the statutory requirements, data subjects have the right to disclosure of the relevant personal data as well as to correction, deletion or restriction of processing of the data. In addition, data subjects have the right to object to processing, the to withdraw consent if processing is based on consent, and the right to lodge a complaint with the supervisory authority.

Data security

Suitable technical and organizational security measures are used to protect the data against accidental or intentional manipulation, partial or complete loss, destruction or unauthorized access by third parties. The security measures are continuously improved in line with technological developments.

Links to other providers' websites

The online offer may contain links to websites of other providers. The site operators have no influence on whether these providers comply with the data protection regulations.


By using the website or making contact, the user consents to the data processing described in this data protection declaration. Protection of minors: Persons under the age of 18 should not transmit personal data without the consent of their parents or legal guardians.

Validity and Changes of the Privacy Statement

This privacy statement is currently valid and has the status of April 2018. Due to the further development of the website or due to changed legal or official requirements, it may be necessary to change this privacy statement.

Responsible Persons

Hohendorf Kierdorf Patentanwälte PartGmbB
Ansprechpartner: Carsten Hohendorf und Theodor Kierdorf
Hohenzollernring 79-83 (Capitol)
50672 Köln
fon: +49 221 42357744
fax: +49 221 42357745

Impressum, Information according §5 TMG:

Hohendorf Kierdorf Patentanwälte PartGmbB
Hohenzollernring 79-83 (Capitol)
50672 Köln
Partnerschaftsregister: PR4722 AG Essen
fon: +49 221 42357744
fax: +49 221 42357745

Value added tax:

Umsatzsteueridentifikationsnummer according § 27 a Umsatzsteuergesetz:

Occupational title and professional regulations:

Occupational title: Patent Attorney; professional representative before the European Patent Office (European Patent Attorney) The professional regulations of the Patent Attorney Code of September 7, 1966 (BGBl. I S. 557) apply, most recently by Article 5 of the Law of October 30, 2017 (BGBl. I S. 3618) has been changed, the professional code of conduct of patent attorneys, decided by the meeting of the chamber acc. § 82 section 2 number 1 of the Patent Attorney Regulations on November 20, 2013, which came into force on March 1, 2014 (Mitt. 2014, 53), and the Code for Professional Conduct des epi (epi-Information 2/2001, p. 75.

Supervisory Authorities:

Patentanwaltskammer (Mitglied als deutscher Patentanwalt)
Tal 29
80331 München

European Patent Institute (Mitglied als European Patent Attorney)
Bayerstr. 83
80335 München

Professional liability insurance:

R+V Versicherung AG
Taunusstr. 1
65193 Wiesbaden

Liability for links:

Our pages contain links to external third-party websites, the content of which we have no influence on. For this reason, we cannot accept liability for this external content. The respective provider or operator is always responsible for the content of the linked websites. The linked websites were checked for possible legal violations at the time the link was created. No illegal content was discernible at the time the link was created. A permanent review of the content of the linked pages is not reasonable. As soon as we become aware of legal violations, we will remove such links immediately.

Photo credits

All images on these pages are from Pixabay. Pixabay is a creative community that shares images and videos free of copyright with others. All content is published under Creative Commons CC0 and includes use for commercial purposes. Profile pictures are the property of the site operator