| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d320485a4ed0904a7da5260fde77f74b |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C235-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-24
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C233-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C233-56
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C235-00 |
| filingDate |
1989-10-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1991-11-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8259f32de00971bf70a6d25a9825a007
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0468fc1327617fcd6acb635080cf7604
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8161421378556b206610fc47dee70c92 |
| publicationDate |
1991-11-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5068429-A |
| titleOfInvention |
Method of purification of the oxalic acid diamide |
| abstract |
A method of removing copper from oxamide obtained through a process which involves the use of copper catalysts, by contacting it with an aqueous solution of a suitable complexing agent, which is capable of forming copper-containing water-soluble complexes and imparts to the aqueous solution a pH comprised between 2 and 8, optionally repeating the contacting step and, finally, recovering the purified oxamide by solid-liquid separation techniques. n The claimed process affords oxamide containing less than 25 ppm of copper. |
| priorityDate |
1986-04-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |