Chromatically compensated particle-beam column
CA 2188997 C · Owner: Martin, Frederick Wight · Inventors: Martin, Frederick Wight
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A particle-beam column comprising a needle-type ions source (1) such as a liquid metal ion source, one or more round lenses (2) and a, plurality of interleaved quadrupole lenses (14 16). Also an ion-beam, column comprising a liquid alloy ion source (1) interleaved quadrupole, lenses (14, 16) and a Wien velocity filter (22). Such columns produce a more finely focused beam than columns based only on electrostatic lenses and allow increased lens apertures and larger beam currents.
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 November 18, 1994 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2016.
- 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.