Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5777233 | Gas-friction vacuum indicator with a gas-friction sensor rotating about a fixed axis of rotation | Bernd Lindenau, Johan K. Fremerey | 1998-07-07 |
| 4619144 | Method of and apparatus for gas pressure measurement by the gas-friction principle | Johan K. Fremery, Bernd Lindenau | 1986-10-28 |