YH

Yasumasa Hayashida

AK Asahi Denka Kogyo: 2 patents #36 of 196Top 20%
AK Asahi Denka Kogyo K.K.: 1 patents #47 of 162Top 30%
Overall (All Time): #1,300,368 of 4,157,543Top 35%
4
Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
5044835 Expansion joint for use in constructing concrete structures Takuo Fukushima, Hiroshi Inoue, Makio Takahashi 1991-09-03
4905429 Device for filling up of recess left in concrete wall after removal Takuo Fukushima, Hiroto Gomi, Kuniharu Kikuma 1990-03-06
4889312 Waterstop for concrete form separator Sunoo Ogou, Shigemichi Ishii, Sadaaki Tagomori, Takuo Fukushima 1989-12-26
4816509 Water swellable sealant Takuo Fukushima, Jinichi Omi 1989-03-28