Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8153959 | Measurement of undisturbed radon ground surface flux using a passive radon surface flux monitor | Frederick Stieff | 2012-04-10 |
| 7312439 | Radon progeny monitor | Payasada Kotrappa, John C. Dempsey | 2007-12-25 |
| 5128540 | Gamma radiation compensated radon measurement system | — | 1992-07-07 |
| 5126567 | Electret gamma/X-ray low level dosimeter | John C. Dempsey | 1992-06-30 |
| 5107108 | Programmable controlled-exposure radon measurement system | Paul R. Ramsey | 1992-04-21 |
| 4926053 | Radon monitor | John C. Dempsey | 1990-05-15 |
| 4729626 | Self-locking fiber optic seal | — | 1988-03-08 |
| 4445364 | Method and apparatus for measuring air infiltration rate into buildings | John C. Dempsey | 1984-05-01 |
| 4336451 | Field method for detecting deposits containing uranium and thorium | — | 1982-06-22 |
| 4268748 | Field method for detecting deposits containing uranium or thorium | — | 1981-05-19 |
| 4262284 | Self-monitoring seal | Charles B. Stieff | 1981-04-14 |
| 4216380 | Field method for detecting deposits containing uranium and thorium | — | 1980-08-05 |