http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-350545-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a3149ecf4fd3c1a547051baa1b05a78b http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_26a4de3a4e835f8c5bbad5d23c4beb12 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01J9-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01J9-04 |
| filingDate | 1930-03-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1931-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-350545-A |
| titleOfInvention | Improvements in cathodes of vacuum electric tube devices |
| abstract | 350,545. Thermionic valves. ROBINSON, E. Y., Garvary, Dryden Road, Bush Hill Park, Enfield, Middlesex, and ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Bush House, Aldwych, London. March 13, 1930, No. 8186. [Class 39 (i).] In making indirectly heated cathodes of small cross section and comprising a metal tube enclosing a refractory metal heating filament covered by a thin refractory insulating tube, the filament is assembled in the insulating tube and the tube is then straightened sufficiently to introduce it into the metal tube. In making the insulating tube, a core of silk thread of larger diameter than the filament is coated with a paste containing porcelain and heated to sinter the porcelain and remove the thread by oxidization. The core may be of aluminium removed by vaporization on heating in vacuo, any aluminium oxidized combining with the porcelain. The coating may be applied by drawing a long thread over wheels rotating in the paste. Fused bauxite, with kaolin as a binder, may be used instead of porcelain, or magnesia, with an agglomerant of starch, dextrin, tar sugar, or gum tragacanth, may be moulded or extruded about the core, or the insulating coating may be sprayed on the core. The heating filament is introduced into the resulting tube and the tube is straightened by heating to the softening point and tensioning the filament. Each leg of a hairpin heater is surrounded by a separate tube. |
| priorityDate | 1930-03-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 19.