| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3a5173a7d063a9f70ca7b5e86fc23863 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S428-914
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S428-913 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B11-24
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B41M5-3275
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B41M5-1455 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B11-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B41M5-327
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B41M5-145
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B11-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B11-24 |
| filingDate |
1979-05-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1981-06-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6c84b7aed861ee75d9caf9833ed3ce0f
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b94685f205a3e7a7b17b4c0ff0bd2ba8 |
| publicationDate |
1981-06-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4274660-A |
| titleOfInvention |
Carbonless duplicating and marking systems |
| abstract |
Dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, esterified dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans and 3,3-(corresponding-substituted-diaryl)-5/6-carboxyphthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, are prepared by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted diphenylamines to produce the phthalides which are then subjected to ring closure to produce the carboxyfluorans which are esterified with alkyl halides or dialkyl sulfates. |
| priorityDate |
1979-05-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |