Electron gun arrangements
CA 2271250 A1 · Owner: Thwaites, Alfred Christopher · Inventors: Cox, Peter Robert John; Carr, David Ward; Bardell, Steven
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electron gun arrangement includes a cathode 1 having a front surface 2 and control, grid 3 located in front of it. The control grid 3 is mounted via a cylindrical support 8 on a, Kovar mount 12. The cathode 1 is supported by a cylindrical support 6 mounted on a Kovar, support 10, Ceramic material 11 being located between the two supports 14 and 12. The, vacuum envelope within which the electron gun is contained includes the Kovar support 12, and a flexible member 13 with which it makes a vacuum seal this member 13 , being of, copper. The copper member 13 is staled to a ceramic cylinder 16 via metal flanges 17 and, 18. The assembly permits the spacing between the cathode and grid 3 …
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 May 7, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2021.
- 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.