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Yokohama, Japan

Masaakira Umehara

USPTO Granted Patents = 16

Average Co-Inventor Count = 2.9

ph-index = 11

Forward Citations = 360(Granted Patents)

Location History:

Tokyo, JP (1979)
Yokohama, JP (1982 - 1993)

Company Filing History:

16 out of 28,577

Ricoh Company, Ltd.

Years Active: 1979-1993

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16 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5196250 - Optical information recording medium (1993-03-23),

2. 5002812 - Optical information recording medium, information recording method and (1991-03-26),

3. 4891305 - Optical information recording element (1990-01-02),

4. 4767693 - Optical information recording medium (1988-08-30),

5. 4758499 - Optical information recording medium (1988-07-19),

6. 4714667 - Optical information recording medium (1987-12-22),

7. 4707431 - Optical information recording medium (1987-11-17),

8. 4696892 - Optical information recording medium (1987-09-29),

9. 4656121 - Optical information recording medium (1987-04-07),

10. 4614705 - Optical information recording medium (1986-09-30),

11. 4477555 - Optical information recording medium (1984-10-16),

12. 4465767 - Optical information recording medium (1984-08-14),

13. 4460665 - Optical information recording medium (1984-07-17),

14. 4332884 - Photo-sensitive and heat-sensitive composition and recording element (1982-06-01),

15. 4315068 - Photo-sensitive and heat-sensitive composition and recording element (1982-02-09),

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