http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3690773-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c2770185591662ab35de7d45f22e5b4d |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J3-51 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J1-1626 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N21-255 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J3-46 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01J3-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01J1-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-25 |
| filingDate | 1970-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1972-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0cc59a8d6e6fb4ecd04011b7faae7fc5 |
| publicationDate | 1972-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-3690773-A |
| titleOfInvention | Dual photoconductive cell photometer |
| abstract | A photometer for measuring the color of aqueous solutions such as polluted water with great sensitivity is provided. The photometer is portable, operates on a low power source, and retains sensitivity despite shock or drift of either the energy source or the light source. The photometer utilizes photoconductive cells in a manner to eliminate the ''''light history'''' effect. A sample filter cell is placed between the lamp source and a regulating filter, which in turn is in front of a first cell, the second filter being designed to reduce the total light reaching the first cell. A second photoconductive cell is positioned to view light directly from the source and at the same time light reflected off of the sample filter. The cells are on opposite legs of a bridge circuit with each leg of the circuit being shunted around the cells to provide for drift control and balance. The bridge circuit is operated at low voltage across each photocell. The difference between the spectral response of the cells is balanced by the impedence of each leg circuit. The color intensity difference between sample filters is read directly on a microammeter across the bridge, the ammeter being chosen to provide as little impedence across the bridge as possible. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9323738-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3922557-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5557415-A |
| priorityDate | 1970-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.