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Kiyotaka Iiyama

USPTO Granted Patents = 18

Average Co-Inventor Count = 2.3

ph-index = 9

Forward Citations = 247(Granted Patents)

Location History:

Yokohama, JA (1977)
Yokohama, JP (1979)
Ibaragi, JP (1990)
Mishima, JP (1985 - 1991)
Sakuramura, JP (1991)

Company Filing History:

17 out of 28,544

Ricoh Company, Ltd.

1 out of 832,680

Other

patents

Years Active: 1977-1991

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18 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5024699 - Leuco dyes and recording materials using the same (1991-06-18),

2. 4981970 - Coloring phthalide compounds (1991-01-01),

3. 4940691 - Coloring phthalide compounds and recording materials using the compounds (1990-07-10),

4. 4925828 - Leuco dyes and recording materials using the same (1990-05-15),

5. 4880762 - Coloring phthalide compounds, method of producing the compounds and (1989-11-14),

6. 4845072 - Thermosensitive recording material (1989-07-04),

7. 4665410 - Multi-color thermosensitive recording material (1987-05-12),

8. 4663641 - Two-color thermosensitive recording adhesive label (1987-05-05),

9. 4638340 - Two-color thermosensitive recording label (1987-01-20),

10. 4620205 - Two-color thermosensitive recording material (1986-10-28),

11. 4620204 - Two-color thermosensitive recording material (1986-10-28),

12. 4613878 - Two-color thermosensitive recording material (1986-09-23),

13. 4517580 - Thermosensitive recording material (1985-05-14),

14. 4511910 - Thermosensitive recording material (1985-04-16),

15. 4507670 - Thermosensitive recording material (1985-03-26),

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