Average Co-Inventor Count = 4.29
ph-index = 7
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. Hitachi, Ltd. (8 from 42,488 patents)
2. Hitachi Engineering Co., Ltd. (1 from 162 patents)
8 patents:
1. 7693910 - Method of searching documents and a service for searching documents
2. 6745183 - Document retrieval assisting method and system for the same and document retrieval service using the same
3. 6654738 - Computer program embodied on a computer-readable medium for a document retrieval service that retrieves documents with a retrieval service agent computer
4. 6584460 - Method of searching documents and a service for searching documents
5. 6457004 - Document retrieval assisting method, system and service using closely displayed areas for titles and topics
6. 6446065 - Document retrieval assisting method and system for the same and document retrieval service using the same
7. 4734848 - Combination reduction processing method and apparatus
8. 4589007 - Semiconductor integrated circuit device