Average Co-Inventor Count = 2.00
ph-index = 2
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. (1 from 42,508 patents)
2. Memorex Corporation (1 from 58 patents)
2 patents:
1. 4083509 - Reel for magnetic recording tape
2. 4064983 - Japanese character word processing system