US2945977A - Fluorescent glow discharge lamp - Google Patents
Fluorescent glow discharge lamp Download PDFInfo
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- US2945977A US2945977A US716141A US71614158A US2945977A US 2945977 A US2945977 A US 2945977A US 716141 A US716141 A US 716141A US 71614158 A US71614158 A US 71614158A US 2945977 A US2945977 A US 2945977A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/64—Cathode glow lamps
Definitions
- Fri tz Sch'cigherr', bgi W is Aim-neg
- This invention relates to glow discharge lamps of the type having a luminescent coating on the inner wall of the glass bulb enclosing the discharge, and having wire type electrodes which are of simple linear shape, i.e., which do not have a spiral r annular shape. Such lamps are quite important for signalling purposes where clear signal colors are desired which may be readily distinguished from each other.
- miniature type fluorescent glow discharge lamps comprising a small elongated or tubular glass bulb pro vided with an internal coating of luminescent material and containing a gas filling essentially of neon together with a small quantity of mercury and having cold electrodes in the form of short cylinders or lengths of wire sealed into one end of the bulb and extending thereinto in more or less parallel side-by-side relation in a direction longitudinally of the bulb axis toward the bowl end of the bulb.
- Such type glow discharge lamps have been characterized by a relatively low luminous intensity, as 'a result of which they have been limited in the amount of socalled end-on light available for signalling and indicat ing purposes, that is, the amount of light obtained on the top or bowl end of the bulb opposite the base or terminal end thereof. While it is possible to increase the luminous intensity of the lamp solely by increasing its power consumption, nevertheless such a manner of obtaining increased luminous intensity has been uniformly avoided up to the present time for the reason that it causes too much sputtering of the electrode material with resultant darkening of the fluorescent material on the lamp bulb.
- Fig. 1 is an elevation, partly in section and on an enlarged scale, of a fluorescent glow discharge lamp comprising my invention.
- Fig. 2 is an elevation, partly in section, of the lamp shown in Fig. 1, taken at right angles thereto.
- Fig. 3 is a sectional view on the line 3-3 of Fig. 1.
- Fig. 4 is an elevation, partly in section and on an enlarged scale, of a modified form of fluorescent glow discharge lamp comprising my invention.
- Fig. 5 is a sectional view on the line 55 of Fig. 4.
- an increase in the luminous intensity of a fluorescent flow discharge lamp of the character described may be obtained by using smaller electrodes, i.e., electrodes of smaller wire diameter, and by arranging them in such a manner that an essential portion of the length of the electrodes, and therefore an essential part of their glow discharge surfaces, is disposed symmetrically with respect to the bowl end of the bulb and extending portions of the electrodes extending in the di around the center thereof, the glow discharge of the lamp having, simultaneously, a relatively high current density.
- the electrodes preferably are formed directly from the leading-in wires of the lamp, that is, they constitute extensions of the leading-in wires, and they are bent over in the form of hooks so that the inner end portions of the electrodes which sustain the glow discharge extend in parallel side-by-side relation in a direction transverse to the bulb axis and are arranged approximately symmet1ically around the center of the bulb bowl.
- the increase in luminous intensity of the glow lamp according to the invention may be accounted for by the fact that, by diminishing the size of the glow electrodes, i.e., by employing electrodes of smaller wire diameter than customary heretofore, an increase in the current density results. This then produces an increase in the tempera-. ture of the electrodes and of the gas filling of the lamp which, in turn, causes a stronger or more etfective evaporation of the mercury in the lamp and, thereby, a higher ultraviolet output.
- the ultraviolet excitation of the internal fluorescent coating on the lamp bulb is also much more favorable by virtue of the concentration of the glow discharge surfaces of theelectrodes around the focus or center of the bulb bowl[ The portions of the electrodes hearing or sustaining the glow discharge are advantageously located a distance of about 2-8 mm., preferably 46 mm., from the inner wall of the bulb bowl.
- the portions of the electrodes hearing or sustaining the glow discharge are advantageously located a distance of about 2-8 mm., preferably 46 mm., from the inner wall of the bulb bowl.
- current densities up to about 0.4 ma./cm. of electrode surface have been obtained, whereas by means of diminishing the size or wire diameter of the glow electrodes in accordance with the in-.
- a furtherconcentration of the glow discharge electrode surface around the center of the bulb bowl may be advantageously obtained by preventing the longitudinally rection ofthe lampbulb axis from sustaining any of the glow discharge.
- the said longitudinally extending portions of the electrodes must have a higher electronic work function than the hook-shapedbent over end portions of the electrodes which are. to sus-- tain-the glow'discharge.
- This result may be effected by providing an insulation on the longitudinally extending portions of the electrodes, as by means of a tightly applied, well adhering insulating layer of glass, silica paste or other suitable anti-glow material.
- the glow discharge light is then concentrated particularly to the bent over inner end or hook portions of the electrodes which extend transversely to the lamp bulb axis around the center of the bulb bowl.
- the glow discharge lamps comprise a sealed light-transmitting elongated or tubular glass bulb 1 which is coated on its inner wall, more particularly on its generally hemispherical bowl end 2, with a layer 3 of a suitable luminescent or fluorescent material which is responsive to mercury vapor excitation, e.g., such as zinc silicate or any of the phosphors commonly used in conventional type positive column fluorescent lamps in use at present for general lighting purposes.
- a suitable luminescent or fluorescent material which is responsive to mercury vapor excitation, e.g., such as zinc silicate or any of the phosphors commonly used in conventional type positive column fluorescent lamps in use at present for general lighting purposes.
- the bulb 1 is provided at its other end with a reentrant stem press 4 in which is sealed a pair of lead-in conductors or wires 5, 6 which are formed with wire-type electrode extensions or cold electrodes 7, 8 extending inwardly of the bulb from the stern press in a direction more or less longitudinally of the bulb axis toward the bowl end 2 thereof.
- the electrodes 7, 8 are bent over, at a point near the bowl end 2 of the bulb l, to form laterally extending portions 9, 10 which constitute an essential portion of the total length of the electrodes and which extend in parallel side-by-side relation in a direction transverse to the bulb axis. As shown, the
- two spaced bent over electrode portions 9, 10 are formed from a simple linear wire electrode instead of being welded to an electrode support as is usual in the case of disk or ring type electrodes.
- wire electrodes 7, 8 have a wire diameter of 0.6
- the bulb diameter of such fluorescent glow lamps may, for instance, amount to 12 mm. and the bulb length, including the base with built-in series resistance, may be about mm.
- the wire electrodes 7, 8 preferably consist of nickel, but they also may be made from any other suitable material, e.g., from iron or an iron-nickel alloy.
- the bulb 1 contains a filling of a suitable inert gas such as argon or a mixture of neon and argon and perhaps, helium, at a relatively low filling pressure of about 20 to mm. of mercury.
- bulb 1 also contains a small quantity of mercury.
- the bent over portions 9, 10 of the wire electrodes 7, 8 are of straight character and extend approximately per pendicularly to the bulb axis.
- the bent over wire electrode portions may be of flattened V-shape, as shown at 11, 12 in Fig. 4.
- the wire electrodes 7, 8 have a wire diameter of approximately 0.8 mm. and a length of approximately 12.0 mm. and the longitudinally extending portions of the electrodes which extend in the general direction of the lamp bulb axis are prevented from sustaining any of the glow discharge by means of a protective layer or coating 13 of a suitable insulating or anti-glow material, such as a layer of silica paste for example, as shown in Fig. 4.
- a protective layer or coating 13 of a suitable insulating or anti-glow material such as a layer of silica paste for example, as shown in Fig. 4.
- a suitable insulating or anti-glow material such as a layer of silica paste for example
- the essential object of the invention of providing increased luminous intensity on the bulb bowl of a fluorescent glow discharge lamp may be obtained by other arrangements and dimensions of the electrodes 7, 8 and, if desired, of the lamp bulb, and also by using a diflerent filling gas or metal vapor, approximately within the previously mentioned'limits.
- a negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, and a single pair only of closely spaced linear wire cold electrodes sealed into the end of the bulb opposite the said bowl end thereof and sustaining therebetween the glow discharge in said lamp, said wire electrodes having an essential portion of their lengths extending in parallel side-by-side relation in a direction transverse to the bulb axis and being disposed substantially symmetrically with respect to the center of said bowl end.
- a negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, a pair of lead-in conductors sealed into the end of the bulb opposite the said bowl end thereof and extending thereinto in the general direction of the bulb axis, and a single pair only of closely spaced linear wire cold electrodes in said bulb sustaining therebetween the glow discharge in said lamp, said electrodes comprising extensions of said lead-in conductors and having an essential portion of their lengths bent over to extend in parallel side-by-side relation in a direction transverse to the bulb axis, said bent over electrode portions being disposed substantially symmetrically with respect to the center of said bowl end.
- a fluorescent glow discharge lamp as specified in claim 2 wherein the portions of the said electrodes extending in the general direction of the bulb axis are provided with a protective coating of anti-glow material to prevent the said electrode portions from supporting the glow discharge.
- a negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, and a pair of linear wire electrodes in said bulb sustaining therebetween the glow discharge in said lamp, said electrodes being constituted of linear wire having a diameter of from 0.4 to 2.0 mm. and being proportioned, with respect to the glow discharge operating current, to have a high current density greater than 0.4 Ina/cm. up to about 5 ma./cm. of electrode surface, said elect-rodes having an essential portion of their lengths extending in parallel sideby-side relation in a direction transverse to the bulb axis and disposed substantially symmetrically with respect to the center of said bowl end.
Description
July 19, 1960 F. SCHONHERR FLUORESCENT GLOW DISCHARGE LAMP Filed Feb. 19, 1958 lnven tov.
Fri tz Sch'cigherr', bgi W is Aim-neg,
United States Patent FLUORESCENT GLow DISCHARGE LAMP Fritz Schiinherr, Berlin-Dahlem, Germany, assignor to Patent-Treuhand-Gesellschaft fiir elektrische Gluhlampen m.b.H.
Filed Feb. 19, 1958, Ser.No. 716,141
Claims priority, application Germany Mar. 28, 1957 5 Claims. (Cl. 313-217) This invention relates to glow discharge lamps of the type having a luminescent coating on the inner wall of the glass bulb enclosing the discharge, and having wire type electrodes which are of simple linear shape, i.e., which do not have a spiral r annular shape. Such lamps are quite important for signalling purposes where clear signal colors are desired which may be readily distinguished from each other.
It is well known to employ for signalling or indicating purposes miniature type fluorescent glow discharge lamps comprising a small elongated or tubular glass bulb pro vided with an internal coating of luminescent material and containing a gas filling essentially of neon together with a small quantity of mercury and having cold electrodes in the form of short cylinders or lengths of wire sealed into one end of the bulb and extending thereinto in more or less parallel side-by-side relation in a direction longitudinally of the bulb axis toward the bowl end of the bulb. Such type glow discharge lamps, however, have been characterized by a relatively low luminous intensity, as 'a result of which they have been limited in the amount of socalled end-on light available for signalling and indicat ing purposes, that is, the amount of light obtained on the top or bowl end of the bulb opposite the base or terminal end thereof. While it is possible to increase the luminous intensity of the lamp solely by increasing its power consumption, nevertheless such a manner of obtaining increased luminous intensity has been uniformly avoided up to the present time for the reason that it causes too much sputtering of the electrode material with resultant darkening of the fluorescent material on the lamp bulb.
It is an object of my invention, therefore, to provide a fluorescent glow discharge lamp of the character referred to having increased luminous intensity on the bowl end of the bulb as compared to that heretofore obtainable for the same power consumption by the lamp.
Further objects and advantages of my invention will appear from the following detailed description of species thereof and from the accompanying drawing.
In the drawing,
Fig. 1 is an elevation, partly in section and on an enlarged scale, of a fluorescent glow discharge lamp comprising my invention.
Fig. 2 is an elevation, partly in section, of the lamp shown in Fig. 1, taken at right angles thereto.
Fig. 3 is a sectional view on the line 3-3 of Fig. 1.
Fig. 4 is an elevation, partly in section and on an enlarged scale, of a modified form of fluorescent glow discharge lamp comprising my invention, and
Fig. 5 is a sectional view on the line 55 of Fig. 4.
According to the present invention, an increase in the luminous intensity of a fluorescent flow discharge lamp of the character described may be obtained by using smaller electrodes, i.e., electrodes of smaller wire diameter, and by arranging them in such a manner that an essential portion of the length of the electrodes, and therefore an essential part of their glow discharge surfaces, is disposed symmetrically with respect to the bowl end of the bulb and extending portions of the electrodes extending in the di around the center thereof, the glow discharge of the lamp having, simultaneously, a relatively high current density. The electrodes preferably are formed directly from the leading-in wires of the lamp, that is, they constitute extensions of the leading-in wires, and they are bent over in the form of hooks so that the inner end portions of the electrodes which sustain the glow discharge extend in parallel side-by-side relation in a direction transverse to the bulb axis and are arranged approximately symmet1ically around the center of the bulb bowl.
The increase in luminous intensity of the glow lamp according to the invention may be accounted for by the fact that, by diminishing the size of the glow electrodes, i.e., by employing electrodes of smaller wire diameter than customary heretofore, an increase in the current density results. This then produces an increase in the tempera-. ture of the electrodes and of the gas filling of the lamp which, in turn, causes a stronger or more etfective evaporation of the mercury in the lamp and, thereby, a higher ultraviolet output. The ultraviolet excitation of the internal fluorescent coating on the lamp bulb is also much more favorable by virtue of the concentration of the glow discharge surfaces of theelectrodes around the focus or center of the bulb bowl[ The portions of the electrodes hearing or sustaining the glow discharge are advantageously located a distance of about 2-8 mm., preferably 46 mm., from the inner wall of the bulb bowl. In the case of well known fluorescent glow discharge lamps used heretofore having plain linear wire type electrodes (i.e., not coiled or. annular electrodes), current densities up to about 0.4 ma./cm. of electrode surface have been obtained, whereas by means of diminishing the size or wire diameter of the glow electrodes in accordance with the in-.
vention and, perhaps, also increasing simultaneously the glow discharge current, current densities of more than 0.4 ma./cm. up to about 5 ma./cm. of electrode surface may be obtained. If the wire electrodes have a-wire diameter of 0.4 to 2.0 mm;, current densities of about 0.5 up to 5 Ina/cm. of electrode surface are usually obtained. As is well known, for the purpose of rating the current intensity of the lamp there has. to be taken into consideration, beside the glow discharge sustaining surface of the electrodes, also the particular design of the glow discharge lamp, more particularly its gas or vapor filling, the gas filling pressure, and thekind of electrode material used, in order to prevent the occurrence of too much sputtering of the'electrodes' and consequent darkening of the luminescentr'naterial; I
A furtherconcentration of the glow discharge electrode surface around the center of the bulb bowl may be advantageously obtained by preventing the longitudinally rection ofthe lampbulb axis from sustaining any of the glow discharge. For such purpose, the said longitudinally extending portions of the electrodes must have a higher electronic work function than the hook-shapedbent over end portions of the electrodes which are. to sus-- tain-the glow'discharge. This result may be effected by providing an insulation on the longitudinally extending portions of the electrodes, as by means of a tightly applied, well adhering insulating layer of glass, silica paste or other suitable anti-glow material. With such a construction, the glow discharge light is then concentrated particularly to the bent over inner end or hook portions of the electrodes which extend transversely to the lamp bulb axis around the center of the bulb bowl.
The accompanying drawing illustrates, on an enlarged scale of approximately 2: 1, various embodiments of fluorescent glow discharge lamps-according to the inven tion, shown without the conventional lamp base for purposes of simplicity. As shown, the glow discharge lamps comprise a sealed light-transmitting elongated or tubular glass bulb 1 which is coated on its inner wall, more particularly on its generally hemispherical bowl end 2, with a layer 3 of a suitable luminescent or fluorescent material which is responsive to mercury vapor excitation, e.g., such as zinc silicate or any of the phosphors commonly used in conventional type positive column fluorescent lamps in use at present for general lighting purposes. The bulb 1 is provided at its other end with a reentrant stem press 4 in which is sealed a pair of lead-in conductors or wires 5, 6 which are formed with wire-type electrode extensions or cold electrodes 7, 8 extending inwardly of the bulb from the stern press in a direction more or less longitudinally of the bulb axis toward the bowl end 2 thereof.
In accordance with the invention, the electrodes 7, 8 are bent over, at a point near the bowl end 2 of the bulb l, to form laterally extending portions 9, 10 which constitute an essential portion of the total length of the electrodes and which extend in parallel side-by-side relation in a direction transverse to the bulb axis. As shown, the
two spaced bent over electrode portions 9, 10 are formed from a simple linear wire electrode instead of being welded to an electrode support as is usual in the case of disk or ring type electrodes.
If the wire electrodes 7, 8 have a wire diameter of 0.6
mm. and a length of 6 mm., there may be obtained, with an electrode surface of about 0.233 cm. and a current intensity of 0.5 ma., a current density of about 2.15 ma/crn. of electrode surface. The bulb diameter of such fluorescent glow lamps may, for instance, amount to 12 mm. and the bulb length, including the base with built-in series resistance, may be about mm. The wire electrodes 7, 8 preferably consist of nickel, but they also may be made from any other suitable material, e.g., from iron or an iron-nickel alloy. The bulb 1 contains a filling of a suitable inert gas such as argon or a mixture of neon and argon and perhaps, helium, at a relatively low filling pressure of about 20 to mm. of mercury. The
bulb 1 also contains a small quantity of mercury.
In the form of the invention shown in Figs. 1-3, the bent over portions 9, 10 of the wire electrodes 7, 8 are of straight character and extend approximately per pendicularly to the bulb axis. As an alternative, the bent over wire electrode portions may be of flattened V-shape, as shown at 11, 12 in Fig. 4.
In another form of fluorescent glow discharge lamp according to the invention, the wire electrodes 7, 8 have a wire diameter of approximately 0.8 mm. and a length of approximately 12.0 mm. and the longitudinally extending portions of the electrodes which extend in the general direction of the lamp bulb axis are prevented from sustaining any of the glow discharge by means of a protective layer or coating 13 of a suitable insulating or anti-glow material, such as a layer of silica paste for example, as shown in Fig. 4. In this case, only the laterally extending or bent-over electrode portions 11, 12, having a length of for example about 6.0 mm., actually constitute the effective glow discharge sustaining electrode surfaces. With a glow lamp of such construction, having an electrode surface of about 0.31 cm. and a current intensity of about 1.5 ma, it is possible to obtain, with a current density of about 4.85 ma./cm. of electrode surface, a materially increased luminous intensity on the bulb bowl 2 as compared to that heretofore obtainable.
It will be understood, of course, that while I have shown and described representative embodiments of my invention, the essential object of the invention of providing increased luminous intensity on the bulb bowl of a fluorescent glow discharge lamp, may be obtained by other arrangements and dimensions of the electrodes 7, 8 and, if desired, of the lamp bulb, and also by using a diflerent filling gas or metal vapor, approximately within the previously mentioned'limits.
What I claim as new and desire to secure by Letters Patent of the United States is:
l. A negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, and a single pair only of closely spaced linear wire cold electrodes sealed into the end of the bulb opposite the said bowl end thereof and sustaining therebetween the glow discharge in said lamp, said wire electrodes having an essential portion of their lengths extending in parallel side-by-side relation in a direction transverse to the bulb axis and being disposed substantially symmetrically with respect to the center of said bowl end.
2. A negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, a pair of lead-in conductors sealed into the end of the bulb opposite the said bowl end thereof and extending thereinto in the general direction of the bulb axis, and a single pair only of closely spaced linear wire cold electrodes in said bulb sustaining therebetween the glow discharge in said lamp, said electrodes comprising extensions of said lead-in conductors and having an essential portion of their lengths bent over to extend in parallel side-by-side relation in a direction transverse to the bulb axis, said bent over electrode portions being disposed substantially symmetrically with respect to the center of said bowl end.
3. A fluorescent glow discharge lamp as specified in claim 1 wherein the said glow discharge surfaces of the electrodes are located a distance of approximately 2 to 8 mm. from the inner wall of the bulb bowl.
4. A fluorescent glow discharge lamp as specified in claim 2 wherein the portions of the said electrodes extending in the general direction of the bulb axis are provided with a protective coating of anti-glow material to prevent the said electrode portions from supporting the glow discharge.
5. A negative glow discharge lamp comprising a sealed light-transmitting bulb containing an inert starting gas at low pressure and a small quantity of mercury, said bulb having a bowl end coated with a luminescent material, and a pair of linear wire electrodes in said bulb sustaining therebetween the glow discharge in said lamp, said electrodes being constituted of linear wire having a diameter of from 0.4 to 2.0 mm. and being proportioned, with respect to the glow discharge operating current, to have a high current density greater than 0.4 Ina/cm. up to about 5 ma./cm. of electrode surface, said elect-rodes having an essential portion of their lengths extending in parallel sideby-side relation in a direction transverse to the bulb axis and disposed substantially symmetrically with respect to the center of said bowl end.
References Cited in the file of this patent UNITED STATES PATENTS 2,298,581 Abadie Oct. 13, 1942 2,357,732 Ehrlich Sept. 5, 1944 2,402,019 Carpenter June 11, 1946 2,564,040 Vance Aug. 14, 1951 2,824,255 Mistler Feb. 18, 1958 2,833,949 Driscoll May 6, 1958 2,838,707 Schwing et a1. June 10, 1958 2,843,805 Brodersen July 15, 1958 2,885,587 Wainio et a1 May 5, 1959
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2945977X | 1957-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2945977A true US2945977A (en) | 1960-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US716141A Expired - Lifetime US2945977A (en) | 1957-03-28 | 1958-02-19 | Fluorescent glow discharge lamp |
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| Country | Link |
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| US (1) | US2945977A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3185994A (en) * | 1960-10-20 | 1965-05-25 | Atlantic Refining Co | Log transcribing and scale changing method and apparatus |
| US3814969A (en) * | 1971-10-25 | 1974-06-04 | Matsushita Electronics Corp | Gas discharge tube with phosphor coating and elongate electrodes |
| FR2393420A1 (en) * | 1977-06-02 | 1978-12-29 | Philips Nv | DISCHARGE LAMP BY GLOW |
| US4204137A (en) * | 1976-07-19 | 1980-05-20 | Thorn Electrical Industries Limited | Fluorescent lamp with refractory metal electrode supports and glass flare seal structure |
| US4415835A (en) * | 1981-06-22 | 1983-11-15 | General Electric Company | Electron emissive coatings for electric discharge devices |
| US4631446A (en) * | 1984-05-04 | 1986-12-23 | Gte Products Corporation | Single-ended high intensity discharge lamp |
| US4835440A (en) * | 1986-10-31 | 1989-05-30 | Kabushiki Kaisha Toshiba | Fluorescent lamp generating different color light beams |
| US4962334A (en) * | 1989-03-27 | 1990-10-09 | Gte Products Corporation | Glow discharge lamp having wire anode |
| US5051655A (en) * | 1987-01-28 | 1991-09-24 | Venture Lighting International, Inc. | Electrodes for single ended arc discharge tubes |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2298581A (en) * | 1940-01-22 | 1942-10-13 | Abadie Jean Baptiste Jo Marcel | Luminescent lamp bulb |
| US2357732A (en) * | 1941-09-08 | 1944-09-05 | Ehrlich Josef | Lamp |
| US2402019A (en) * | 1944-10-04 | 1946-06-11 | Westinghouse Electric Corp | Glow lamp |
| US2564040A (en) * | 1949-07-12 | 1951-08-14 | Bell Telephone Labor Inc | Glow discharge voltage control device |
| US2824255A (en) * | 1952-11-28 | 1958-02-18 | Westinghouse Electric Corp | Auxiliary electrode and shield for a low pressure discharge device |
| US2833949A (en) * | 1955-12-13 | 1958-05-06 | Burroughs Corp | Glow indicating tube |
| US2838707A (en) * | 1956-09-13 | 1958-06-10 | Duro Test Corp | Fluorescent lamp and method of making |
| US2843805A (en) * | 1957-08-12 | 1958-07-15 | Westinghouse Electric Corp | Electric discharge apparatus |
| US2885587A (en) * | 1956-06-13 | 1959-05-05 | Westinghouse Electric Corp | Low pressure discharge lamp and method |
-
1958
- 1958-02-19 US US716141A patent/US2945977A/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2298581A (en) * | 1940-01-22 | 1942-10-13 | Abadie Jean Baptiste Jo Marcel | Luminescent lamp bulb |
| US2357732A (en) * | 1941-09-08 | 1944-09-05 | Ehrlich Josef | Lamp |
| US2402019A (en) * | 1944-10-04 | 1946-06-11 | Westinghouse Electric Corp | Glow lamp |
| US2564040A (en) * | 1949-07-12 | 1951-08-14 | Bell Telephone Labor Inc | Glow discharge voltage control device |
| US2824255A (en) * | 1952-11-28 | 1958-02-18 | Westinghouse Electric Corp | Auxiliary electrode and shield for a low pressure discharge device |
| US2833949A (en) * | 1955-12-13 | 1958-05-06 | Burroughs Corp | Glow indicating tube |
| US2885587A (en) * | 1956-06-13 | 1959-05-05 | Westinghouse Electric Corp | Low pressure discharge lamp and method |
| US2838707A (en) * | 1956-09-13 | 1958-06-10 | Duro Test Corp | Fluorescent lamp and method of making |
| US2843805A (en) * | 1957-08-12 | 1958-07-15 | Westinghouse Electric Corp | Electric discharge apparatus |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3185994A (en) * | 1960-10-20 | 1965-05-25 | Atlantic Refining Co | Log transcribing and scale changing method and apparatus |
| US3814969A (en) * | 1971-10-25 | 1974-06-04 | Matsushita Electronics Corp | Gas discharge tube with phosphor coating and elongate electrodes |
| US4204137A (en) * | 1976-07-19 | 1980-05-20 | Thorn Electrical Industries Limited | Fluorescent lamp with refractory metal electrode supports and glass flare seal structure |
| FR2393420A1 (en) * | 1977-06-02 | 1978-12-29 | Philips Nv | DISCHARGE LAMP BY GLOW |
| US4415835A (en) * | 1981-06-22 | 1983-11-15 | General Electric Company | Electron emissive coatings for electric discharge devices |
| US4631446A (en) * | 1984-05-04 | 1986-12-23 | Gte Products Corporation | Single-ended high intensity discharge lamp |
| US4835440A (en) * | 1986-10-31 | 1989-05-30 | Kabushiki Kaisha Toshiba | Fluorescent lamp generating different color light beams |
| US5051655A (en) * | 1987-01-28 | 1991-09-24 | Venture Lighting International, Inc. | Electrodes for single ended arc discharge tubes |
| US4962334A (en) * | 1989-03-27 | 1990-10-09 | Gte Products Corporation | Glow discharge lamp having wire anode |
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