Average Co-Inventor Count = 3.55
ph-index = 3
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 (4 from 58,130 patents)
4 patents:
1. 5860523 - Tape cassette receiving housing
2. 5474249 - Method for producing tape leaders for hubs
3. 5239436 - Tape cartridge with increased tape capacity
4. 4131717 - Magnetic recording medium