http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-485875-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_18a3206eaadc0ccb8c66ffbb4e7a66f4 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-68 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-68 |
| filingDate | 1936-12-02^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1938-05-26^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-485875-A |
| titleOfInvention | Improvements in or relating to mercury luminous electric discharge devices |
| abstract | 485,875. Discharge lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand Ges. f³r Eloktrische Gluhlampen) Dec. 2, 1936, Nos. 33087/36 and 28753/37. [Class 39 (i)] [Also in Group XX] In a gas- or vapour-filled electric discharge lamp provided with material adapted to be excited to luminescence by the discharge, the luminescent material is, or contains in admixture with other luminescent materials, a solid solution of 96-93 parts by weight of calcium tungstate and 4-7 parts by weight (preferably 5 parts) of lead tungstate. The material may be prepared in any of the known ways of making calcium tungstate, the replacement of calcium by lead being effected in the starting materials; or the two tungstates, prepared separately, may be mixed and heated. The material may be within, or embedded in, or outside, the lamp envelope ; in the two last cases the material of the envelope must transmit the radiation, usually ultra-violet, which excites luminescence. The discharge may be (1) a low pressure discharge between cold, unactivated electrodes in a mixture of mercury vapour and rare gas ; (2) a lowpressure mercury discharge with an activated or thermionic cathode permitting higher current density ; (3) a discharge through neon as described in Specification 457,486, or through neon mixed with heavier rare gas, as described in Specification 476,240 ; or (4) a high-pressure discharge in mercury vapour (but not excluding other materials such as zinc and cadmium) in an envelope transparent to ultra-voilet, e.g. quartz. In the first and third cases the luminescent material is within the envelope in the second case it may be inside or outside and in the fourth case it is outside. |
| priorityDate | 1936-12-02^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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