Cold-cathode ionisation manometer with two separate cathodes for a long service life
CA 2499729 A1 · Owner: Wilfert, Stefan · Inventors: Wilfert, Stefan; Edelmann, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a cold-cathode ionisation manometer for measuring pressure in a vacuum, said manometer operating according to the inverse magnetron principle and being used to measure pressures in fine vacuums high , vacuums, and ultrahigh vacuums (preferably between 10 Pa and 1 Pa). The aim of the invention is to reduce the contamination tendency and thus to extend the service life of said measuring tubes. To this end a measuring tube comprising , two separately controlled cathodes (K1 K2) and a common anode (A), enabling , two independent discharges to be ignited inside the same is used. While a , discharge (K1) which is directly localised at the inlet of the measuring tube …
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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
- Filed September 17, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2025.
- 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.