Average Co-Inventor Count = 1.66
ph-index = 5
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 (8 from 58,129 patents)
8 patents:
1. 5143217 - Tape-cartridge case with thin, single layer side wall for reading UPC
2. 4918558 - Magnetic tape cassette having reel locks controlled by an optical tape
3. 4896238 - Tape cassette with pressable cap for fixing reel on reel base
4. 4864448 - Tape cassette
5. 4791504 - Tape cassette with lid lock and tape characteristic indicating member
6. D293569 - Reel for a video tape cassette
7. D293570 - Reel for a video tape cassette
8. 4646188 - VTR tape cassette