Average Co-Inventor Count = 5.00
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. Matsushita Electric Industrial Co., Ltd. (3 from 27,375 patents)
3 patents:
1. D285553 - Telephone set with automatic dialer and speaker phone
2. D284467 - Telephone answering machine
3. D279372 - Telephone answering machine with handset