Alpha gauging device for ambient suspended particulates
CA 2111816 A1 · Owner: Vandrish, George E. · Inventors: Davidson, Lyle A.; Vandrish, George E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an alpha gauging device for ambient suspended particulates, comprising, a tray housing reference and sample substrates, a source of alpha particles which may be mono or multienergetic, an absorber for adjusting the energy of the alpha particle beam, and an alpha particle detector. The source tray, absorber and detector are oriented such that said alpha particle beam is incident on said sample or reference substrates and said transmitted beam is incident on said alpha particle detector.
Read the whole patent
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
- Filed December 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2015.
- 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.