Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7312439 | Radon progeny monitor | Payasada Kotrappa, Lorin R. Stieff | 2007-12-25 |
| 5126567 | Electret gamma/X-ray low level dosimeter | Lorin R. Stieff | 1992-06-30 |
| 5104554 | Removing radon by downhole sparging of air | — | 1992-04-14 |
| 5008540 | Electret gamma/X-ray low level dosimeter | — | 1991-04-16 |
| 4926053 | Radon monitor | Lorin R. Stieff | 1990-05-15 |
| 4853536 | Ionization chamber for monitoring radioactive gas | Payasada Kotrappa | 1989-08-01 |
| 4814608 | Subsoil radioactive gas measuring system | Payasada Kotrappa | 1989-03-21 |
| 4493207 | Method and apparatus for measuring the rate at which air infiltrates into and out of buildings | — | 1985-01-15 |
| 4445364 | Method and apparatus for measuring air infiltration rate into buildings | Lorin R. Stieff | 1984-05-01 |