BUNKA SHUTTER CO., LTD.
12Patents
5Active
12Granted
36Portfolio score
Filing activity: Mar 31, 1975 → Jul 2, 2019
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5065806A | Panel shutter assembly | Fixed Constructions | 23 | Expired |
| US3989084A | Rolling shutter | Fixed Constructions | 20 | Expired |
| US4838331A | Slat opening/closing drive mechanism in shutter equipment | Fixed Constructions | 16 | Expired |
| US6065546A | Fire extinguishing and smoke eliminating apparatus and method using water mist | Human Necessities | 15 | Expired |
| US5072766A | Panel shutter assembly | Fixed Constructions | 12 | Expired |
| US6630235B2 | Bullet-proof glass screen, and bullet-proof glass screen device | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4595043A | Shutter device | Fixed Constructions | 9 | Expired |
| US9670697B2 | Door device with pressure difference mitigating mechanism | Fixed Constructions | 2 | Active |
| US9810011B2 | Opening/closing device | Fixed Constructions | 2 | Active |
| US11746585B2 | Connection member for construction materials, connecting fitting therefor, connecting structure therefor, and connecting method therefor | Fixed Constructions | 1 | Active |
| US11746586B2 | Connecting device for construction materials, connecting structure therefor, and connecting method therefor | Fixed Constructions | 0 | Active |
| US12276155B2 | Connecting fitting construction materials and connecting method therefor | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.