Average Co-Inventor Count = 3.75
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. Tokyo Electric Co. (2 from 492 patents)
2. Konishiroku Photo Industry Co., Ltd. (1 from 1,252 patents)
2 patents:
1. 4509874 - Apparatus for securing a typewriter
2. 4441110 - Printing head protecting device in ink jet printer