Growing community of inventors

Tokyo, Japan

Masahiro Hayakawa

Average Co-Inventor Count = 1.42

ph-index = 9

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 280

Masahiro HayakawaKosei Kosako (2 patents)Masahiro HayakawaYuichi Ichikawa (2 patents)Masahiro HayakawaYutaka Hirano (2 patents)Masahiro HayakawaKousei Kosako (2 patents)Masahiro HayakawaOsamu Shindo (1 patent)Masahiro HayakawaSachio Hasushita (1 patent)Masahiro HayakawaToshiaki Ueda (1 patent)Masahiro HayakawaYasuhiko Endoh (1 patent)Masahiro HayakawaHideo Ashida (1 patent)Masahiro HayakawaHideki Ikuta (1 patent)Masahiro HayakawaMasahiro Hayakawa (19 patents)Kosei KosakoKosei Kosako (48 patents)Yuichi IchikawaYuichi Ichikawa (11 patents)Yutaka HiranoYutaka Hirano (8 patents)Kousei KosakoKousei Kosako (2 patents)Osamu ShindoOsamu Shindo (64 patents)Sachio HasushitaSachio Hasushita (50 patents)Toshiaki UedaToshiaki Ueda (24 patents)Yasuhiko EndohYasuhiko Endoh (4 patents)Hideo AshidaHideo Ashida (4 patents)Hideki IkutaHideki Ikuta (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Asahi Kogaku Kogyo Kabushiki Kaisha (15 from 3,132 patents)

2. Fujitsu Corporation (3 from 39,245 patents)

3. Asahi Kogaku Kogyo K.k. (1 from 176 patents)


19 patents:

1. 6374057 - Data imprinting system for camera

2. 6130993 - Camera having an image stabilizer

3. 5946501 - Waterproof and/or water-resistant camera

4. 5907729 - Camera having cover mechanism of film chamber

5. 5822631 - Forced-driving apparatus for film rewinding motor of a camera

6. 5713048 - Waterproof and/or water-resistant camera

7. 5708875 - Camera having electronic flash equipment

8. 5452034 - Regulated parallax compensation system for a camera finder

9. 5406346 - Adaptor for film cartridge

10. 5345285 - View finder and camera having same

11. 5305041 - Remotely controllable camera system

12. 5305031 - Sealed case

13. 5153622 - Pressure alarm for water-sealed camera

14. 5111222 - Pressure alarm in water-sealed camera

15. 5070348 - Waterproof and/or water-resistant camera

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as of
1/8/2026
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