Average Co-Inventor Count = 2.84
ph-index = 15
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.
Company Filing History:
1. Ricoh Company, Ltd. (67 from 28,577 patents)
2. Hitachi, Ltd. (40 from 42,508 patents)
3. Hitachi Car Engineering Co., Ltd. (16 from 248 patents)
4. Other (6 from 832,880 patents)
5. Hitachi Automotive Systems, Ltd. (3 from 2,028 patents)
6. Seikagaku Corporation (3 from 191 patents)
119 patents:
1. 12265225 - Light guide member and display device
2. 12181673 - Propagation optical system and virtual image display device
3. 11892118 - Display stand and display stand system
4. 11779593 - Agent for improving ocular subjective symptoms and method thereof
5. 11746947 - Stand and stand system
6. 11421815 - Stand, stand system, and rotating unit for display device
7. 11185558 - Agent for improving ocular subjective symptoms and method thereof
8. 11147831 - Agent for improving ocular subjective symptoms and method thereof
9. 10225531 - Image display unit, image projection unit, and image projection apparatus
10. 10197894 - Dustproof member for image generation device and image projection apparatus
11. 10012893 - Image projection apparatus
12. 9713282 - Cooling apparatus, image projection apparatus, and electronic device
13. 9678416 - Light source device provided with cooler and image projection device including light source device provided with cooler
14. 9671681 - Image projection apparatus
15. 9645478 - Cooling device, image projection apparatus, and electronic apparatus