Grids
CA 2240302 A1 · Owner: Pickering, Alan Hugh · Inventors: Pickering, Alan Hugh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A grid for use in a linear electron beam tube such as an IOT or TWT includes a grid section 3 and a focus electrode 4 between which is included an accommodation portion 5. The grid is mounted in the tube by a mounting flange 6 around its outer periphery. During use, the grid section 3 becomes hot and consequently expands but the mounting flange 6 remains relatively cool being connected to a relatively massive structure. Thin flexible strips 9 of the accommodation section 5 permit movement between the mounting flange 6 and the grid section 3 due to differential thermal expansion thus minimising distortion to the grid section which might otherwise occur if it were connected directly to the …
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 June 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2020.
- 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.