GB732439A - Improvements in and relating to electron emissive compositions - Google Patents
Improvements in and relating to electron emissive compositionsInfo
- Publication number
- GB732439A GB732439A GB584/52A GB58452A GB732439A GB 732439 A GB732439 A GB 732439A GB 584/52 A GB584/52 A GB 584/52A GB 58452 A GB58452 A GB 58452A GB 732439 A GB732439 A GB 732439A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- binder
- thermo
- alkaline
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 title 1
- 239000011230 binding agent Substances 0.000 abstract 3
- 239000011347 resin Substances 0.000 abstract 3
- 229920005989 resin Polymers 0.000 abstract 3
- 239000000020 Nitrocellulose Substances 0.000 abstract 2
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 abstract 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 abstract 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 abstract 2
- 229920001220 nitrocellulos Polymers 0.000 abstract 2
- 229940079938 nitrocellulose Drugs 0.000 abstract 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 1
- 239000001856 Ethyl cellulose Substances 0.000 abstract 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 abstract 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract 1
- 230000003213 activating effect Effects 0.000 abstract 1
- 229940072049 amyl acetate Drugs 0.000 abstract 1
- PGMYKACGEOXYJE-UHFFFAOYSA-N anhydrous amyl acetate Natural products CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 abstract 1
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 229920002301 cellulose acetate Polymers 0.000 abstract 1
- 239000008199 coating composition Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000007859 condensation product Substances 0.000 abstract 1
- 229920001249 ethyl cellulose Polymers 0.000 abstract 1
- 235000019325 ethyl cellulose Nutrition 0.000 abstract 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 abstract 1
- 239000004312 hexamethylene tetramine Substances 0.000 abstract 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 abstract 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 229910052726 zirconium Inorganic materials 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
A coating composition for cathodes of electric discharge lamps consists of a suspension of an alkaline-earth compound, such as an alkaline-earth carbonate, in a cellulosic binder to which has been added a thermo-setting resin. The cellulose binder may be nitro-cellulose, ethyl cellulose or cellulose acetate, dissolved in amyl or butyl acetate; this binder decomposes completely at 200 DEG C., i.e. below the temperature reached during sealing-in of the cathode mount. The thermo-setting resin may be a condensation product of phenol and furfural with addition of hexamethylenetetramine; this cures to a solid plastic at 150-160 DEG C. but does not decompose below 450 DEG C. and is thus only driven off at the final activating temperature of 1200 DEG C. The amount of resin is small and in an example is 2-5 grams per 140 ml. of nitrocellulose solution to which 3-5 grams of powdered metallic zirconium may be added.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US205727A US2683837A (en) | 1951-01-12 | 1951-01-12 | Electron emissive composition and method of application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB732439A true GB732439A (en) | 1955-06-22 |
Family
ID=22763387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB584/52A Expired GB732439A (en) | 1951-01-12 | 1952-01-08 | Improvements in and relating to electron emissive compositions |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2683837A (en) |
| DE (1) | DE926381C (en) |
| GB (1) | GB732439A (en) |
| NL (1) | NL81188C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3749467A (en) * | 1971-03-15 | 1973-07-31 | Duro Test Corp | Fluorescent lamps and method of manufacturing the same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2975015A (en) * | 1958-07-17 | 1961-03-14 | Internat Telephone & Telegraph | Image converter and method and apparatus for producing the same |
| FR1326443A (en) * | 1962-03-22 | 1963-05-10 | Lampes Elect Fab Reunies | Method and apparatus for filling an envelope with inert gas and active vapor at a relatively high pressure by simple introduction without pumping |
| US3211511A (en) * | 1963-01-30 | 1965-10-12 | Gen Electric | Electric lamp manufacture |
| US3413054A (en) * | 1966-12-30 | 1968-11-26 | Sylvania Electric Prod | Method of fabricating an incandescent lamp and its construction |
| US3978563A (en) * | 1973-12-04 | 1976-09-07 | U.S. Philips Corporation | Method of manufacturing an electric discharge tube having an oxide cathode |
| US4836816A (en) * | 1988-05-06 | 1989-06-06 | Gte Products Corporation | Method of treating tungsten cathodes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1691446A (en) * | 1925-03-28 | 1928-11-13 | Westinghouse Lamp Co | Electron-discharge device with oxide-coated filament |
| US1795918A (en) * | 1926-09-11 | 1931-03-10 | John Stogdell Stokes | Process for reducing the viscosity of nitrocellulose solutions |
| US2310866A (en) * | 1941-02-25 | 1943-02-09 | Du Pont | Luminescent tube |
| US2363028A (en) * | 1941-12-16 | 1944-11-21 | Carl J Warnke | Cathode filament |
-
0
- NL NL81188D patent/NL81188C/xx active
-
1951
- 1951-01-12 US US205727A patent/US2683837A/en not_active Expired - Lifetime
-
1952
- 1952-01-08 GB GB584/52A patent/GB732439A/en not_active Expired
- 1952-01-11 DE DEI5408A patent/DE926381C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3749467A (en) * | 1971-03-15 | 1973-07-31 | Duro Test Corp | Fluorescent lamps and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| US2683837A (en) | 1954-07-13 |
| NL81188C (en) | |
| DE926381C (en) | 1955-04-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES207960A1 (en) | Thermionic cathode and method of manufacturing same | |
| GB732439A (en) | Improvements in and relating to electron emissive compositions | |
| GB859510A (en) | Stabilized acrylonitrile polymers | |
| US2311513A (en) | Method of applying luminescent coating | |
| US2921047A (en) | Stabilized poly(ethylene oxide) composition | |
| US2707687A (en) | Method of forming luminescent coating | |
| US2499307A (en) | Barium di-silicate phosphor | |
| US2440303A (en) | Increasing the resistance of red phosphorus to oxidation | |
| GB717362A (en) | Improvements in and relating to electron emission coating mixtures | |
| US2535360A (en) | Stabilized thermoplastic cellulose ether composition | |
| US2225704A (en) | Luminescent material | |
| GB316104A (en) | Improvements relating to coated cathodes for electron discharge devices | |
| US2312268A (en) | Fluorescent material | |
| US2552654A (en) | Heat-resistant cathode coatings | |
| US2226404A (en) | Luminescent material | |
| GB657212A (en) | Improvements relating to the preparation of solutions of polyvinyl chloride | |
| GB610345A (en) | Improvements in or relating to adhesive compositions | |
| US2421984A (en) | Material for gettering electron discharge devices | |
| GB646575A (en) | Fluorescent material | |
| GB642742A (en) | Improvements in luminescent materials | |
| GB650730A (en) | Improvements in and relating to electron emitting materials | |
| GB582729A (en) | Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices | |
| ES432514A1 (en) | Method of manufacturing an electric discharge tube having an oxide cathode | |
| GB597425A (en) | Improvements in and relating to the production of luminescent coatings | |
| US3973691A (en) | Fluorescent lamp having improved phosphor coating |