http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-475482-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d647e846645953f86e9ba89e7f5ead3d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03H9-02015 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03H9-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03H9-17 |
| filingDate | 1937-06-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1937-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-475482-A |
| titleOfInvention | Improvements relating to piezo-electric crystals |
| abstract | 475,482. Piezo - electric crystals. BRITISH THOMSON-HOUSTON CO., Ltd. June 29, 1937, No. 18073. Convention date, June 29, 1936. [Class 40 (v)] A Rochelle - salt, urotropin, or like rod S, vibrating longitudinally at a substantially lower frequency than a similar quartz rod, is cut from a plate p in the plane of, and has its longest axis equally inclined to, the axes a, c, the elasticity (shown by curve E) of the crystal being at a minimum in this direction. The electrodes are parallel to the plane of Fig. 2, so that the rod vibrates longitudinally in a direction normal to the electric field. Such crystals are able to stand stresses up to 15 volts without fracture, and are freed from coupling oscillations and harmonic oscillations by having their width less than one third of their length. For protection against the effects of temperature and moisture, the rods may be bedded in non-hygroscopic substances such as copal. |
| priorityDate | 1936-06-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 19.