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For the Inventor, By the Inventor

Tokyo, Japan

Keiichiro Nakai

This inventor holds 9 USPTO granted patents. Top assignee: Otis Elevator Company. Active years: 1991-1992.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiichiro Nakai. Retrieved from https://idiyas.com/inventor/keiichiro-nakai

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

USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 2.0

ph-index = 5

Forward Citations = 78(Granted Patents)


Company Filing History:

goldMedal9 out of 2,722 
 
Otis Elevator Company
 patents

Years Active: 1991-1992

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9 patents (USPTO):Explore Patents
1. 5105109 - Support structure for a linear motor drive type of elevator (1992-04-14),
2. 5074384 - Rope weight compensating device for a linear motor driven elevator (1991-12-24),
3. 5052522 - Encoder installing structure (1991-10-01),
4. 5036955 - Column vibration system for a linear motor driven elevator (1991-08-06),
5. 5033588 - Apparatus for maintaining an air gap in a toroidal linear motor (1991-07-23),
6. 5033587 - Braking system for a linear motor driven elevator (1991-07-23),
7. 5014826 - Apparatus for maintaining an air gap in a toroidal type linear motor (1991-05-14),
8. 5009288 - Sheave array arrangement for elevator (1991-04-23),
9. 5005672 - Air gap apparatus for a linear motor (1991-04-09),

Title: Innovations by Keiichiro Nakai

Introduction

Keiichiro Nakai is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of elevator technology, holding a total of 9 patents. His work focuses on enhancing the efficiency and functionality of linear motor-driven elevators.

Latest Patents

Nakai's latest patents include a support structure for a linear motor drive type of elevator. This invention features a stator member mounted in the elevator hoistway, allowing for vibrational movement. The stator mounts enable rotational movement and apply a longitudinal tensioning force, which is absorbed by a spring to mitigate vibrations. Another notable patent is a rope weight compensating device for a linear motor-driven elevator. This device compensates for the rope weight using a cable suspended from the counterweight and the elevator car, supplying electrical power to the moving member of the linear motor.

Career Highlights

Keiichiro Nakai is currently employed at Otis Elevator Company, a leader in the elevator and escalator industry. His innovative designs and patents have contributed to advancements in elevator technology, improving safety and efficiency in vertical transportation.

Collaborations

Nakai has collaborated with notable colleagues, including Manabu Suganuma and Yoshinori Nakanishi. Their teamwork has fostered a creative environment that encourages the development of groundbreaking technologies in the elevator sector.

Conclusion

Keiichiro Nakai's contributions to elevator technology through his patents and collaborations highlight his role as an influential inventor in the industry. His work continues to shape the future of vertical transportation systems.

Profile summary based on public USPTO records.
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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