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For the Inventor, By the Inventor

Toyota, Japan

Tadao Hasegawa

This inventor holds 13 USPTO granted patents. Top assignees: Toyota Jidosha Kabushiki Kaisha, Denson Corporation, Toyota Jidosha Kogyo Kabushiki Kaisha. Active years: 1980-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tadao Hasegawa. Retrieved from https://idiyas.com/inventor/tadao-hasegawa

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

USPTO Granted Patents = 13

% Patents Active = 92.3

Average Co-Inventor Count = 2.5

ph-index = 5

Forward Citations = 85(Granted Patents)


Location History:

  • Teromachi, JP (1980)
  • Toyota, JP (1985 - 2007)

Company Filing History:

goldMedal12 out of 38,912 
 
Toyota Jidosha Kabushiki Kaisha
 patents
silverMedal1 out of 14 
 
Denson Corporation
 patents
bronzeMedal1 out of 1,838 
 
Toyota Jidosha Kogyo Kabushiki Kaisha
 patents
where one patent can have more than one assignee

Years Active: 1980-2007

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13 patents (USPTO):Explore Patents
1. 7204215 - Valve characteristic controller and control method for internal combustion engine (2007-04-17),
2. 6135077 - Valve timing changing apparatus for internal combustion engine (2000-10-24),
3. 6131541 - Variable valve performance mechanism in internal combustion engine (2000-10-17),
4. 6067947 - Valve driving apparatus for engine (2000-05-30),
5. 6014952 - Valve timing control apparatus for an internal combustion engine (2000-01-18),
6. 5988128 - Valve driving apparatus for engine (1999-11-23),
7. 5988127 - Valve lifter structure (1999-11-23),
8. 5924397 - Variable valve performance apparatus for engine (1999-07-20),
9. 5893345 - Valve control apparatus for an internal combustion engine (1999-04-13),
10. 5870984 - Variable engine valve driver (1999-02-16),
11. 5816204 - Variable valve timing mechanism for internal combustion engine (1998-10-06),
12. 4545334 - Lubricating oil cooling system for rear or mid engined vehicle (1985-10-08),
13. 4192520 - Seal structure (1980-03-11),
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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