http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3688119-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_aacb0a6f3b4ddaffc5b3e291c9b096f6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N27-64 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G08B17-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G08B17-113 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01T7-125 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G08B17-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G08B17-113 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01T7-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N27-64 |
| filingDate | 1970-07-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1972-08-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_30b5b433acd52e6d323ef7eca0699427 |
| publicationDate | 1972-08-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-3688119-A |
| titleOfInvention | Ionization smoke detector |
| abstract | An ionization smoke detector having open and closed ionization chambers each having at least two electrodes and a radioactive source. The electrodes are connected in series across a voltage supply and the change of impedance of the open ionization chamber is detected by a field effect transistor which in turn fires a silicon controlled rectifier. The silicon controlled rectifier is provided with a holding circuit so that when utilizing a pulsating voltage, the silicon controlled rectifier will be maintained in a conductive state even though the pulsating voltage periodically approaches zero. The invention further contemplates means for controlling the current through the source-drain path of the field effect transistor so that wide voltage fluctuations will not damage the transistor or produce erroneous alarm signals. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4401979-A |
| priorityDate | 1969-07-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.