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Patent applications and USPTO patent grants for Dempsey; John C..The latest application filed is for "radon progeny monitor".
Patent | Date |
---|---|
Radon progeny monitor Grant 7,312,439 - Kotrappa , et al. December 25, 2 | 2007-12-25 |
Removing radon by downhole sparging of air Grant 5,104,554 - Dempsey April 14, 1 | 1992-04-14 |
Radon monitor Grant 4,926,053 - Dempsey , et al. May 15, 1 | 1990-05-15 |
Subsoil radioactive gas measuring system Grant 4,814,608 - Dempsey , et al. March 21, 1 | 1989-03-21 |
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