JH

Johannes Holtgreve

UN Unknown: 2 patents #12,644 of 83,584Top 20%
📍 Schwelm, DE: #29 of 106 inventorsTop 30%
Overall (All Time): #1,664,215 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5005328 Roofing vent cover with plug detent connection 1991-04-09
4955167 Roof vent pipe 1990-09-11
4843794 Roofing slab 1989-07-04