Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5412976 | Apparatus for determining the air permeability of a cloth web | — | 1995-05-09 |
| 4891967 | Method and apparatus for determining the average fineness of loose fibres | — | 1990-01-09 |
| 4348611 | Ferroelectric or pyroelectric sensor utilizing a sodium nitrite layer | Wolfgang Ruppel, Ullrich Hetzler, Peter Wilhelm Wurfel | 1982-09-07 |
| 4259365 | Method for creating a ferroelectric or pyroelectric body | Wolfgang Ruppel, Ullrich Hetzler, Peter Wilhelm Wurfel | 1981-03-31 |