Average Co-Inventor Count = 2.25
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. West Electric Co., Ltd. (3 from 145 patents)
2. Matsushita Electric Industrial Co., Ltd. (1 from 27,375 patents)
3 patents:
1. 4306176 - Operation indicator for automatic flash device
2. 4251854 - Light angle indicator of photographic flash
3. 4078240 - Photographic flash device