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. Matsushita Electric Industrial Co., Ltd. (2 from 27,375 patents)
2. Machiko Hirano (0 patent)
3. Hideki Sakumoto (0 patent)
2 patents:
1. 5121271 - Cassette holder device capable of receiving large and small size
2. 5101304 - Cassette holder device capable of preventing erroneous insertion of