| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e9e11ac16e9c5716e1f3e12ecaeb06ff |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S501-903
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-315 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C3-095
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C3-076
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C21-002
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C21-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C3-095
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C3-076
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02C7-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B1-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C21-00 |
| filingDate |
1975-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1976-12-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d3d076ba241337f25f24e66ee213e279
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4595b4e1eed9e326bba3fb37e6878450
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_68c81ada0d4b75f85beb1cf15c847428 |
| publicationDate |
1976-12-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3997250-A |
| titleOfInvention |
High strength ophthalmic lens |
| abstract |
An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micrometers in depth can be formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide, about 3 to about 15 percent potassium oxide provided the total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent and about 3 to about 15 percent lanthanum oxide. The ion exchange process can take place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5091675-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/LU-91938-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4562161-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4719186-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5714422-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4130407-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2013115752-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2013269392-A1 |
| priorityDate |
1975-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |