Average Co-Inventor Count = 2.25
ph-index = 1
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. Sony Corporation (2 from 58,131 patents)
2. Sony Magnescale Inc. (1 from 40 patents)
3 patents:
1. 5383625 - Reel holder for use in tape winding apparatus
2. 4549237 - Tape machine
3. 4486799 - Tape guide device for video tape recorder