Radon detector
CA 1293570 C · Owner: Thomson, Ian · Inventors: Thomson, Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radon gas detector instrument comprising: a filter for trapping alpha radon daughters of said gas, an air pump for drawing ambient air through the filter, a DRAM devoid of an alpha particle barrier layer, located adjacent the filter for exposure to alpha particles trapped by the filter apparatus for cyclically relaxing all cells of the DRAM, waiting for a significant period of time for cells of the DRAM to become charged by said alpha particles, then reading the DRAM to determine the number of charged cell in the DRAM, a display connected to the relaxing, waiting and reading means for displaying a count of the number of charged cells in units correlated to the intensity of randon gas in …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.