| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f7c9f8065e9a1049438e46822af65773 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M3-22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M15-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04M15-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04M3-22 |
| filingDate |
1973-01-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1974-12-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8567caa33c9f4a19b2387b5701b55f6c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_eba16133940834d0b74c11c24f37b538 |
| publicationDate |
1974-12-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3852533-A |
| titleOfInvention |
Sampling and analog-to-digital converter apparatus for use in a telephone message metering system |
| abstract |
Disclosed is a local message metering system which detects the analog voltage of a telephone subscriber metering line caused by the trunk circuit of a telephone exchange. Analog gates are employed for periodically sampling the voltage on the subscriber lines to be monitored. The gates are resistance coupled to the metering line with a high impedance input circuit which insures that the metering system does not disturb the operation of the switching entities. The analog voltage of the metering line is converted through an A-to-D converter to a digital representation which indicates subscriber usage information. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0135626-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0039500-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0135626-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6963737-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2002177430-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4066843-A |
| priorityDate |
1973-01-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |