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For the Inventor, By the Inventor

Tokyo, Japan

Gradco Ltd.

Calculating rank
USPTO Granted Patents = 7

% Expired Patents = 57.1

Trademarks = 1

Forward Citations = 31

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14 inventors (with patents filed for the assignee):

goldMedal Umehara Kenji (4 out of 5 patents)

silverMedal Jeong-Ho Kim (2 out of 6 patents)

bronzeMedal Seung-kyoon Noh (2 out of 7 patents)

4.  Jae-Geol Choi (2 out of 4 patents)

5.  Seung-Gweon Lee (2 out of 3 patents)

6.  Yeon-Kawan Chung (1 out of 2 patents)

7.  Seong-Kyoon Noh (1 out of 2 patents)

8.  Yeon-Kwan Jung (1 out of 1 patent)

9.  Seung Kyoon Noh (1 out of 3 patents)

10.  Frederick J Lawrence (1 out of 23 patents)

11.  George M Cross (1 out of 10 patents)

12.  William D Baker (1 out of 11 patents)

13.  Mark Spitler (1 out of 1 patent)

14.  Louis A Rossi (1 out of 1 patent)


7 patents:

1. 7690636 - Finishing apparatus in copying machine (2010-04-06),
2. 7487959 - Eject mechanism with grip in finisher (2009-02-10),
3. 7217075 - Tape feeder and method of controlling the same (2007-05-15),
4. 7147217 - Paper binding system of image forming apparatus and method for controlling the same (2006-12-12),
5. 7120384 - Paper processing unit for binding device (2006-10-10),
6. 7063248 - Stapler moving guide device (2006-06-20),
7. 5603494 - Sheet mailbox having a rotatable sheet distributor (1997-02-18),
Company Overview
Gradco Ltd. is a leading provider of industrial equipment and services. With over 20 years of experience, we specialize in providing high-quality solutions for the mining, construction, and manufacturing industries. Our team of experts is dedicated to delivering innovative products and exceptional customer service. Visit our website to learn more about our comprehensive range of products and services.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

7 Patents

#2,288 in Tokyo

#5,459 in Japan

Tokyo, JP
Tokyo, Japan

Gradco Ltd.

Forward Citations = 31

14 inventors:

goldMedal Umehara Kenji (4 out of 5 patents)

silverMedal Jeong-Ho Kim (2 out of 6 patents)

bronzeMedal Seung-kyoon Noh (2 out of 7 patents)

4.  Jae-Geol Choi (2 out of 4 patents)

5.  Seung-Gweon Lee (2 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Gradco Ltd.. Retrieved from https://idiyas.com/company/gradco

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]
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