Compact low pressure mercury vapour discharge lamp and a method for its manufacture
CA 1319393 C · Owner: Bjorkman, Ake · Inventors: Bjorkman, Ake
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compact low-pressure mercury vapour discharge lamp comprises two or more straight tubes (2,3) which are interconnected by means of couplings (4), to form a discharge chamber between two electrodes (15). The electrodes are located in the outermost ends (7,8) of the discharge chamber of the lamp, these ends being connected in a gastight manner to a lamp base (9) incorporating the requisite contact pins (11,12) and conductors (16). Located downstream of the electrodes (15) in the direction of the discharge current are tube constrictions (13,14) which define around the electrodes (15) the spaces in which released ions from the electrode emission material are held concentrated, so as to fall …
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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
- Granted June 22, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 22, 2010.
- 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.