| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3492a7406879265b1f567f37d98dbbaf |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C2217-23
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C2218-11
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-131
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C2217-214 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-025
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01J61-302
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C17-25
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01J61-72 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C17-25 |
| filingDate |
1970-03-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1971-11-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_eb8cd401a395a0c0c0b09cfcb14587f3 |
| publicationDate |
1971-11-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3617357-A |
| titleOfInvention |
Lamp envelope with a thin transparent buffer film on its inner surface |
| abstract |
The inner surface of a soda-lime-silicate glass envelope for a fluorescent lamp or similar mercury-discharge device is coated with a thin film of submicroscopic fibrous crystals of boehmite (A10(OH)) prior to the phosphor coating operation. The envelope is subsequently heated to thermally decompose the boehmite crystals in situ and transform them into fibrils and rodlike particles of gamma alumina (Al2O3) that are bonded to the glass surface. The heating is advantageously achieved during the bulblehring operation after the bulb is coated with phosphor. The gamma alumina particles chemically react with the sodium and other alkali constituents of the glass to form inert compounds and thus provide a transparent ''''buffer'''' film which, in the finished lamp, inhibits the formation of black alkali-mercury deposits on the inner surface of the envelope during lamp operation. The lumen maintenance of the lamp is accordingly enhanced. Deposition of the boehmite crystals is achieved by coating the envelope interior with a 0.5 percent to 5 percent aqueous solution of a colloidal boehmite complex that consists of 85 percent by weight crystalline boehmite, having 13 percent by weight of acetic acid and 2 percent by weight of water attached to the boehmite fibrils. Transformation of the boehmite into rodshaped gamma alumina is achieved by heating the envelope to a temperature of at least 400* C. percent by weight of acetic acid and 2 percent by weight of water attached to the boehmite fibrils. Transformation of the boehmite into rod-shaped gamma alumina is achieved by heating the envelope to a temperature of at least 400* C. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4079288-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7648649-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7274045-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5838100-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007114562-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006169986-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6906475-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006169998-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007103050-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4916359-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0128697-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5552665-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005001532-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7358542-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7847309-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6867536-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007205712-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3845343-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006208270-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7550910-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7088038-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2009020775-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7497973-B2 |
| priorityDate |
1970-03-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |