Average Co-Inventor Count = 1.71
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. Tdk Electronics Company, Limited (3 from 333 patents)
2. Tdk Corporation (1 from 7,977 patents)
4 patents:
1. D317155 - Demagnetizer for magnetic head of cassette tape recorder
2. D266419 - Magazine of magnetic tape
3. 4267986 - Magnetic tape cassette
4. D258287 - Video tape cassette