| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_af99df08b153738cd418446a75d09bfc |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S507-933
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S507-902
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-2989 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-72
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J13-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J4-04 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J4-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J13-04 |
| filingDate |
1990-05-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b97b43bb7fa0645b54307aecb5daadf3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d35ccaf060938e0a1dc93633cd38429d |
| publicationDate |
1991-11-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0454881-A1 |
| titleOfInvention |
Controlled-release compositions for acids |
| abstract |
A controlled release, encapsulated acid composition and a method of preparation are disclosed. The composition comprises (1) a porous matrix having an acid absorbed therein, the matrix being substantially inert to the absorbed acid; (2) a midlayer surrounding the matrix, this midlayer consisting essentially of at least one salt of the absorbed acid; and (3) a membrane surrounding the matrix, the membrane being exterior of the midlayer, the membrane further being substantially inert to the midlayer and permeable to a selected environment. The membrane preferably also includes particulate material which acts as an anticoalescent. n The midlayer can be applied as a coating to the acid-bearing matrix, or it can be evolved by exposing the acid-bearing matrix to a base such as ammonia gas or a solid metal oxide for a time sufficient to allow reaction of a proportion of the acid at or near the surface of the matrix with the base or oxide to form a layer of the corresponding salt. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9248319-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4339801-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2009100995-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9199211-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-102008000290-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1616851-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8597789-B2 |
| priorityDate |
1987-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |