http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-3917006-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b106f81d5dbc4e91bd140d72b44e06d0 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04R31-003 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B35-52 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04R31-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-52 |
| filingDate | 1989-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ab50e3d90f30a2b1565e0114e96efded |
| publicationDate | 1990-12-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-3917006-A1 |
| titleOfInvention | METHOD FOR PRODUCING A DIAPHRAGM FOR AN ACOUSTIC SYSTEM FROM BORED DOTS, CARBONATED MATERIALS |
| abstract | Process is claimed for the prodn. of a diaphragm for an acoustic device (I), made of boron-doped, carbon-contg. materials based on a carbon/carbon composite material (II). (II) contains, as main components, graphite powder with pronounced cystallinity and high elastic modulus, pitch and a carbide derived from synthetic resins, with the graphite crystals oriented in the plane of a film; the process comprises (a) addn. of a boron cpd. (III) to the component materials of (II) and (b) heating the mixt. obtd. to a predetermined high temp. to distribute the boron dopant uniformly in (II). USE/ADVANTAGE - (I) is useful as a diaphragm for loudspeakers and microphones; provides a light-wt. material with high elasticity, high acoustic velocity and good rigidity (w.r.t. prior-art materials), and with low sound distortion, wide range of reproduction and a clear tonal quality. Used for large-scale application; there are no complicated steps and no loss of original shape or dimensions during moulding. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0507655-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2674718-A1 |
| priorityDate | 1989-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 33.