Average Co-Inventor Count = 1.33
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. Sanyo-Kokusaku Pulp Co., Ltd. (1 from 65 patents)
2. Honshu Seishi Kabushiki Kaisha (1 from 20 patents)
3. Kyokuetsu Cooperation Co., Ltd. (1 from 1 patent)
4. Jyoni Business Forms Co., Ltd. (1 from 1 patent)
2 patents:
1. 5167998 - Postcards and reply postcards for confidential purposes
2. 4801074 - Sealed letter