Average Co-Inventor Count = 1.00
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. Nichimen Corporation (2 from 8 patents)
2. Tokyo Shutter Co., Ltd. (1 from 1 patent)
2 patents:
1. 5237776 - Sealing devices for doors
2. 5199478 - Air-tightening devices in folding doors and windows