For the Inventor, By the Inventor

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Daejeon, South Korea

Visoft Ltd.

USPTO Granted Patents = 2

% Expired Patents = 100.0

Trademarks = 1

Forward Citations = 5

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4 inventors (with patents filed for the assignee):

Dongsoo Han (1 out of 3 patents)

Dong-soo Han (1 out of 5 patents)

In-Je Lee (1 out of 1 patent)

4. Jong-Young Koo (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 8594003 - Method of estimating location of mobile device in transportation using WiFi (2013-11-26),

2. 8423282 - Road guidance service method and navigation system for implementing the method (2013-04-16),

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USPTO Data Jan 1 1976 - Sep 22 2026

2 Patents

#214 in Daejeon

#3,780 in South Korea

Daejeon, South Korea

Visoft Ltd.

Forward Citations = 5

4 inventors:

Dongsoo Han (1 out of 3 patents)

Dong-soo Han (1 out of 5 patents)

In-Je Lee (1 out of 1 patent)

4. Jong-Young Koo (1 out of 1 patent)

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