% Expired Patents = 14.3

Forward Citations = 122

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5 inventors (with patents filed for the assignee):

George Benda (4 out of 5 patents)

Patricia Turner (2 out of 2 patents)

Clifford H Kraft (1 out of 20 patents)

4. John E Groetsema (1 out of 1 patent)

5. Michael Fleck (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 6685891 - Apparatus and method for purifying air (2004-02-03),

2. 6289288 - Method of determining measured gas data with remote sensors (2001-09-11),

3. 6019535 - Felt-tip pen cover with eraser (2000-02-01),

4. 5871294 - Felt tip pen cover with eraser (1999-02-16),

5. 5798945 - Apparatus for building environmental reporting and control (1998-08-25),

6. 5564065 - Carbon monoxide air filter (1996-10-08),

7. 5553006 - Method and apparatus for building environmental compliance (1996-09-03),

Company Overview

Chelsea Group Ltd. is a leading international conglomerate with diversified business interests in real estate, hospitality, and financial services. With a strong focus on innovation and sustainability, Chelsea Group aims to deliver exceptional value to its customers and stakeholders worldwide.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

7 Patents

#21 in Itasca, IL

#1,885 in Illinois

#39,929 in US

Itasca, IL, United States of America

Chelsea Group Ltd.

Forward Citations = 122

5 inventors:

George Benda (4 out of 5 patents)

Patricia Turner (2 out of 2 patents)

Clifford H Kraft (1 out of 20 patents)

4. John E Groetsema (1 out of 1 patent)

5. Michael Fleck (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Chelsea Group Ltd.. Retrieved from https://idiyas.com/company/chelsea-group

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]