WO1997010611A1 - Re-usable light bulb - Google Patents

Re-usable light bulb Download PDF

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Publication number
WO1997010611A1
WO1997010611A1 PCT/IB1996/000946 IB9600946W WO9710611A1 WO 1997010611 A1 WO1997010611 A1 WO 1997010611A1 IB 9600946 W IB9600946 W IB 9600946W WO 9710611 A1 WO9710611 A1 WO 9710611A1
Authority
WO
WIPO (PCT)
Prior art keywords
adapter
facility
supply outlet
current supply
type
Prior art date
Application number
PCT/IB1996/000946
Other languages
French (fr)
Inventor
Mark Joseph Lesch
Original Assignee
Gehr, Gisela
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gehr, Gisela filed Critical Gehr, Gisela
Priority to DE69628655T priority Critical patent/DE69628655T2/en
Priority to EP96929464A priority patent/EP0850488B1/en
Priority to BR9610544A priority patent/BR9610544A/en
Priority to US09/043,198 priority patent/US6054812A/en
Priority to JP09511798A priority patent/JP2000516758A/en
Priority to AU73000/96A priority patent/AU717500B2/en
Priority to CA002232057A priority patent/CA2232057C/en
Publication of WO1997010611A1 publication Critical patent/WO1997010611A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/02—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies
    • H01K9/04—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies with built-in manually operated switch

Definitions

  • a filament type light bulb only has a certain lifespan. Once the filament has become worn away in response to continuous use, it breaks thus rendering the bulb defective and of no use any more. At this time the bulb, except for the filament, is normally still intact but has to be disposed of.
  • the object of this invention is thus to provide a light bulb which can be re-used thus lengthening its useful lifespan.
  • This invention relates to an electric current utilising facility connectable to an electric current supply outlet for causing the conduction of current along a desired circuit along the facility in response to manipulation of the facility.
  • the invention finds useful application when applied to a multiple use filament type light bulb.
  • Multi-filament light bulbs are known in the art.
  • Various approaches of changing between the filaments have been suggested.
  • another filament is caused to become electrically connected by the base of the lamp being formed with a plurality of suitably isolated foldable contact members with a further contact member becoming exposed on folding away the contact member of the defective filament.
  • an electric current utilising facility conventionally connectable to an electric current supply outlet for causing the diversion of current along a desired circuit in response to manipulation of the facility.
  • Figure 1 three dimensionally shows one embodiment of an electric current utilising facility in the form of a light bulb
  • Figure 2 shows another embodiment of the light bulb of the invention in side elevation
  • Figure 3 three dimensionally shows an adapter, according to the invention by means of which a bayonet type light bulb is connectable to a screw in socket type outlet.
  • the bulb 10 comprises a circuit carrying device in the form of a globe 12 fitted with a number of independent filament circuits 14, and a circuit selecting mechanism providing a swivellable member firmly securable to a matchingly formed current supply outlet as provided by a sleeve 16 which snugly but freely swivellably in the direction of arrow 17 sits onto the stem 18 of the globe 12 while being retained against slipping owing to the stem 18 providing a ridge 20 on its socket engaging side.
  • the sleeve 16 is fitted with pins 22 enabling the bayonet coupling engagement of the bulb 10 to a conventional light bulb socket outlet.
  • Each circuit 14 extends between its own contact 24, 26 and 28 and an arcuate common base contact 30 and inco ⁇ orates a filament 32.
  • the leads 34 of the circuits 14 and filaments 32 are conventionally light bulb fashion supported to also limit the possibility of short circuiting between the circuits 14.
  • the three independent lead wires of the three filaments 32 can, for example, extend on both sides along capillary apertures along a core 36.
  • the globe 12 is fitted with fuses 38 along each of the circuits 14.
  • the member firmly securable to a matchingly formed current supply outlet is in this embodiment in the form of a ring 40 which snugly but freely swivellably fits along a groove 41 in the stem 18 of the globe 12.
  • the ring 40 is fitted with pins 42 spaced to bayonet coupling fashion engage the bulb 10 to a conventional light bulb socket outlet.
  • the ring 40 is shown freely swivellable, its extent of swivelling can be limited with the contacts being suitably positioned to cause connection of a circuit when swivelled to and end stop. To this effect the ring can thus be coveredly sunken with the pins projecting through slots of suitable lengths to achieve the end stop effect.
  • the contact mounting base 44 in the case of both embodiments can be in the form of a printed circuit, or can be glass based or be from injection moulded substance fitted with contacts.
  • an adapter 46 enables the connection of a bayonet connection type light bulb 10 to a conventional screw in type electric current supply outlet.
  • the adapter 46 thus has an end electrical contact 48 isolated from its side wall 50.
  • its side wall is slotted with generally L- shaped slots 52 extending inward from the edge 54 of the adapter 46 into which the pins 22 or 42 are received and held once the adapter 10 is fitted to a bulb 10.
  • the end of the adapter 46 engageable with the screw in type socket outlet is suitably threaded.
  • a pair of contact 56 are mounted within the adapter 24 in the configuration of the contacts of a bayonet connection type outlet.
  • the one contact is this electrically connected to the side wall 50 and the other to the electrical contact 48 while being isolated from one another by, for example, being mounted in a plug of isolating material (not shown in detail).
  • the adapter 46 is shown separately it will be appreciated that it can also be in the form of a permanent fixture to the bulb 10. In such case connection between the adapter 46 and the bulb 10 need not be by way of the slots 52 although the adapter 46 will naturally have to accommodate the pins 22, 42 of the bulb 10.
  • the bulb 10 is operatively mounted in a way similar to an ordinary bayonet coupling type bulb with the pins 22, 42 coming into engagement with the slots of the bayonet type outlet.
  • the one contact of the outlet will thus make electrical connection with the common base contact 30 while the other contact will make electrical contact with the one of the contacts 24, 26 or 28.
  • the globe 12 is simply swivelled by hand until the appropriate contact configuration is achieved.
  • the two contacts of the conventional bayonet couplable type outlet are spring loaded, proper contact is maintained. It will be appreciated that the contacts 24, 26, 28 and 30 of the base must not stand up to a large extent from their base to permit ease of swivelling the globe 12 relative to the outlet once operatively mounted.
  • the selected filament 32 thus serves as light providing source once the bulb 10 is activated.
  • the bulb 10 can still be used by simply manually swivelling the globe 12 relative to its outlet until another base contact makes the required electric connection thus interspacing a further filament 32 along the circuit.
  • the figure 1 embodiment provides for even a third filament 32 and even more can be fitted depending on the available space.
  • the filaments 32 can, for example, have differing values thus enabling setting the brightness of the light by simply appropriately swivelling the globe 12 relative to the outlet to which it is connected. It can even serve as an on off switch by simple swivelling the bulb out of appropriate contact.
  • the adapter 46 When requiring connection of a bayonet connection type light bulb 10 to a conventional screw in type electric current supply outlet, the adapter 46 is used.
  • the adapter 46 is simply bayonet fashion connected to a bulb 10, in a way similar too discussed with respect to the bayonet type coupling, and the assembly then engaged with a screw fashion engageable outlet until the end contact 48 makes electrical contact.
  • the adapter contacts 56 can also be spring loaded to promote continuous electrical contact.
  • the adapter 46 can also be in the form of a permanent fitting, as said above. If not in the form of a permanent fitting, the bulb 10 and adapter 46 form a set assemblable into an assembly comprising the bulb 10 as fitted with the adapter 46.

Landscapes

  • Connecting Device With Holders (AREA)

Abstract

There is provided an electric current utilising facility conventionally connectable to an electric current supply outlet for causing the diversion of current along a desired circuit in response to manipulation of the facility. One embodiment of an electric current utilising facility is in the form of a re-usable light bulb (10). The bulb (10) comprises a circuit carrying device in the form of a globe (12) fitted with a number of independent filament circuits (14), and a circuit selecting mechanism providing a swivellable member firmly securable to a matchingly formed current supply outlet as provided by a sleeve (16) which snugly but freely swivellably in the direction of arrow (17) sits onto the stem (18) of the globe (12) while being retained against slipping owing to the stem (18) providing a ridge (20) on its socket engaging side. The sleeve (16) is fitted with pins (22) enabling the bayonet coupling engagement of the bulb (10) to a conventional light bulb socket outlet.

Description

(1) TITLE OF THE INVENTION
Re-usable light bulb.
(2) CROSS REFERENCED APPLICATIONS
The following prior art disclosures relate to the same field of invention.
CN 1 052 749 A
CN 1 057 129 A
CN 1 062 618 A
DE 2 924 200 C ES 8 600 568 A
GB 1 362 646 A
JP 60 189 157 A
RU 2 000 629 C
RU 2 007 781 II US 3 673 534
RU 2 031 475 Cl
US 4 179 637 A
(3) BACKGROUND TO THE INVENTION
A filament type light bulb only has a certain lifespan. Once the filament has become worn away in response to continuous use, it breaks thus rendering the bulb defective and of no use any more. At this time the bulb, except for the filament, is normally still intact but has to be disposed of. The object of this invention is thus to provide a light bulb which can be re-used thus lengthening its useful lifespan.
(3. 1) FIELD OF THE INVENTION
This invention relates to an electric current utilising facility connectable to an electric current supply outlet for causing the conduction of current along a desired circuit along the facility in response to manipulation of the facility. Although not so limited, the invention finds useful application when applied to a multiple use filament type light bulb. (3.2) PRIOR ART DESCRIPTION
Multi-filament light bulbs are known in the art. Various approaches of changing between the filaments have been suggested. According to one arrangement, another filament is caused to become electrically connected by the base of the lamp being formed with a plurality of suitably isolated foldable contact members with a further contact member becoming exposed on folding away the contact member of the defective filament. (US Pat 3 673 534).
(4) SUMMARY OF THE INVENTION
According to the invention there is provided an electric current utilising facility conventionally connectable to an electric current supply outlet for causing the diversion of current along a desired circuit in response to manipulation of the facility.
(5) BRIEF DESCRIPTION OF THE DRAWING
The invention is now described, by way of example, with reference to the accompanying drawings. In the drawings
Figure 1 three dimensionally shows one embodiment of an electric current utilising facility in the form of a light bulb,
Figure 2 shows another embodiment of the light bulb of the invention in side elevation, and
Figure 3 three dimensionally shows an adapter, according to the invention by means of which a bayonet type light bulb is connectable to a screw in socket type outlet.
(6) DETAILED DESCRIPTION OF THE DRAWINGS
Referring to figure 1 of the drawings, one embodiment of an electric current utilising facility in the form of a re-usable light bulb is generally indicated by reference numeral 10. The bulb 10 comprises a circuit carrying device in the form of a globe 12 fitted with a number of independent filament circuits 14, and a circuit selecting mechanism providing a swivellable member firmly securable to a matchingly formed current supply outlet as provided by a sleeve 16 which snugly but freely swivellably in the direction of arrow 17 sits onto the stem 18 of the globe 12 while being retained against slipping owing to the stem 18 providing a ridge 20 on its socket engaging side. The sleeve 16 is fitted with pins 22 enabling the bayonet coupling engagement of the bulb 10 to a conventional light bulb socket outlet.
Each circuit 14 extends between its own contact 24, 26 and 28 and an arcuate common base contact 30 and incoφorates a filament 32. The leads 34 of the circuits 14 and filaments 32 are conventionally light bulb fashion supported to also limit the possibility of short circuiting between the circuits 14. In this respect the three independent lead wires of the three filaments 32 can, for example, extend on both sides along capillary apertures along a core 36. The globe 12 is fitted with fuses 38 along each of the circuits 14.
Referring to figure 2 and in another embodiment of the light bulb 10, the member firmly securable to a matchingly formed current supply outlet is in this embodiment in the form of a ring 40 which snugly but freely swivellably fits along a groove 41 in the stem 18 of the globe 12. The ring 40 is fitted with pins 42 spaced to bayonet coupling fashion engage the bulb 10 to a conventional light bulb socket outlet. Like components of this embodiment are given the same reference numbers as in the figure 1 embodiment. Although the ring 40 is shown freely swivellable, its extent of swivelling can be limited with the contacts being suitably positioned to cause connection of a circuit when swivelled to and end stop. To this effect the ring can thus be coveredly sunken with the pins projecting through slots of suitable lengths to achieve the end stop effect.
The contact mounting base 44 in the case of both embodiments can be in the form of a printed circuit, or can be glass based or be from injection moulded substance fitted with contacts.
Referring to figure 3 an adapter 46 enables the connection of a bayonet connection type light bulb 10 to a conventional screw in type electric current supply outlet. The adapter 46 thus has an end electrical contact 48 isolated from its side wall 50. To permit bayonet type engagement of the bulb 10 with the adapter 46, its side wall is slotted with generally L- shaped slots 52 extending inward from the edge 54 of the adapter 46 into which the pins 22 or 42 are received and held once the adapter 10 is fitted to a bulb 10. The end of the adapter 46 engageable with the screw in type socket outlet is suitably threaded. Although not shown in detail, a pair of contact 56 are mounted within the adapter 24 in the configuration of the contacts of a bayonet connection type outlet. The one contact is this electrically connected to the side wall 50 and the other to the electrical contact 48 while being isolated from one another by, for example, being mounted in a plug of isolating material (not shown in detail). Although the adapter 46 is shown separately it will be appreciated that it can also be in the form of a permanent fixture to the bulb 10. In such case connection between the adapter 46 and the bulb 10 need not be by way of the slots 52 although the adapter 46 will naturally have to accommodate the pins 22, 42 of the bulb 10.
In use and referring first to figures 1 and 2, the bulb 10 is operatively mounted in a way similar to an ordinary bayonet coupling type bulb with the pins 22, 42 coming into engagement with the slots of the bayonet type outlet. The one contact of the outlet will thus make electrical connection with the common base contact 30 while the other contact will make electrical contact with the one of the contacts 24, 26 or 28. If not making proper contact or if making contact with two of the contacts 24, 26 or 28, the globe 12 is simply swivelled by hand until the appropriate contact configuration is achieved. As the two contacts of the conventional bayonet couplable type outlet are spring loaded, proper contact is maintained. It will be appreciated that the contacts 24, 26, 28 and 30 of the base must not stand up to a large extent from their base to permit ease of swivelling the globe 12 relative to the outlet once operatively mounted.
The selected filament 32 thus serves as light providing source once the bulb 10 is activated. When one filament 32 becomes defect, normally because of its burning away and breaking off, the bulb 10 can still be used by simply manually swivelling the globe 12 relative to its outlet until another base contact makes the required electric connection thus interspacing a further filament 32 along the circuit. The figure 1 embodiment provides for even a third filament 32 and even more can be fitted depending on the available space.
Although discussed as a long life-type bulb as compared to a single filament type, it will be appreciated that the bulb can serve other purposes as well. The filaments 32 can, for example, have differing values thus enabling setting the brightness of the light by simply appropriately swivelling the globe 12 relative to the outlet to which it is connected. It can even serve as an on off switch by simple swivelling the bulb out of appropriate contact.
When requiring connection of a bayonet connection type light bulb 10 to a conventional screw in type electric current supply outlet, the adapter 46 is used. The adapter 46 is simply bayonet fashion connected to a bulb 10, in a way similar too discussed with respect to the bayonet type coupling, and the assembly then engaged with a screw fashion engageable outlet until the end contact 48 makes electrical contact. Although not shown the adapter contacts 56 can also be spring loaded to promote continuous electrical contact. The adapter 46 can also be in the form of a permanent fitting, as said above. If not in the form of a permanent fitting, the bulb 10 and adapter 46 form a set assemblable into an assembly comprising the bulb 10 as fitted with the adapter 46.

Claims

(7) CLAIMS
(1) An electric current utilising facility connectable to an electric current supply outlet for causing the conduction of current along a desired circuit along the facility in response to manipulation of the facility comprising
a circuit carrying device incorporating a plurality of separate circuits extending from a corresponding plurality of suitably spaced contact points and which device is arranged to current conducting fashion cause at least two of the contacts points to make at least indirect electrical connection with such current supply outlet thus causing the current to flow along the at least one selected circuit and,
a circuit selecting mechanism arranged to enable the manual displacement of at least part of the device relative to such supply outlet, without requiring disengagement of the facility from such outlet, once the facility is operatively connected, to select the desired circuit along the device.
(2) A facility as claimed in claim 1 in which one of the contact points is formed to serve as common contact for the various circuits.
(3) A facility as claimed in claim 1 or claim 2 in which the circuit selecting mechanism is arranged to enable manual displacement of at least part of the device relative to a current supply outlet in response to a swivelling action between the device and such outlet.
(4) A facility as claimed in claim 3 in which the contact points are located on the outlet engaging end of the device requiring displacement of the whole device relative to a current supply outlet on selecting a further circuit, such outlet thus being of a kind permitting the displacement of the device relative there to, even if via an appropriately formed adapter, once the facility is operatively fitted.
(5) A facility as claimed in claim 4 in which the circuit selecting mechanism includes a member swivellably mounted to the circuit carrying device while being firmly but removably securable to a non-screw in type matchingly formed current supply outlet or an adapter formed to be received into a screw in type current supply outlet for swivellable and removable operative securing of the device.
(6) A facility as claimed in claim 5 in which the swivellable member is provided by a sleeve snugly but easily swivellably and against lateral displacement fitting the supply outlet connecting end region of the circuit carrying device, the sleeve being securely receivable into a matchingly dimensioned and formed socket providing current supply outlet or an adapter formed to be received into a screw in type current supply outlet.
(7) A facility as claimed in claim 6 in which the sleeve is fitted with appropriately located pins to enable the bayonet coupling engagement of the facility to a complementary formed current supply outlet, or to an adapter formed to be received into a screw in type current supply outlet.
(8) A facility as claimed in claim 5 in which the member is provided by a ring swivellably mounted to the supply outlet connecting end region of the device and fitted with appropriately located pins to enable the bayonet coupling engagement of the facility to a complementary formed current supply outlet, or to an adapter formed to be received into a screw in type current supply outlet.
(9) A facility as claimed in claim 7 or claim 8 which is in the form of a re-usable light bulb of which the circuit carrying device is in the form of a globe incorporating a plurality of curcuits each providing a separate illuminating filament with the socket connecting end and thus stem of the globe being fitted with the swivellable member conventionally engageable with a bayonet globe type engaging socket as provided by a bayonet type current supply outlet or an adapter receivable into a screw-in type current supply outlet, appropriate swivelling of the globe relative to the member and thus an appropriate current supply outlet, once the light bulb is operatively fitted, thus causing the electrical connection of another filament which, amongst others, permits the selection of another filament in the case of failure of the filament which was in use.
(10) A facility as claimed in claim 9 which includes an adapter for enabling the connection of a bayonet connection type light bulb to a conventional screw in type electric current supply outlet, with the adapter thus having an end electrical contact isolated from its side wall while being suitably arranged to permit spigot and socket fashion connection between the bulb and the adapter as being formed to snugly fit onto the swivellable member of the light bulb while the other side of the adapter is conventionally threaded for enabling its screw in type engagement with such screw in type outlet, the adapter being fitted with a pair of contacts suitably mounted inside it to enable a conventional bayonet type connection between the bulb and the adapter with the contacts of the adapter being connected the one to the side wall, and the other to the adapter end contact for causing the bulb to be powered via such screw in type current supply outlet.
(11) A facility as claimed in claim 10 in which the adapter is appropriately slotted from its bulb engaging edge to permit a conventional bayonet type coupling between the bulb and the adapter.
(12) A facility as claimed in claim 10 or claim 11 in which the adapter forms a permanent feature of the bulb.
(13) A light bulb set comprising
a multi use light bulb incoφorating a globe having a plurality of circuits each providing a separate illuminating filament with the socket connecting end of the globe being fitted with an appropriate pin presenting swivellable member conventionally engageable with a bayonet type globe engaging socket with appropriate swivelling of the globe relative to the swivellable member and thus a socket type current supply outlet, once the light bulb is operatively fitted, thus causing the electrical connection of a different filament which, amongst others, permits the selection of another filament in the case of failure of the filament which was in use, and
an adapter for enabling the connection of a bayonet type light bulb to a conventional screw in type electric current supply outlet with the adapted being suitably slotted from its bulb engaging edge to permit conventional spigot and socket fashion connection between the bulb and the adapter which snugly but easily swivellably fits via the swivellable member onto the bulb while the other side of the adapter is conventionally threaded for enabling its screw in type engagement with such screw in type outlet, the adapter as having an end electrical contact isolated from its side wall, being fitted with a pair of contacts suitably mounted inside it to enable, in conjunction with its slotting arrangement, a conventional bayonet type connection between the bulb and the adapter while one contact of the adapter is connected to the side wall and the other contact to the adapter end contact for causing the lamp to be powered via such screw in type current supply outlet.
(14) An electric current utilising facility substantially as described with reference to the accompanying drawings.
(15) A light bulb set substantially as described with reference to the accompanying drawings.
(16) An electric current utilising facility whenever assembled from a light bulb set as claimed in claim 13 or claim 15.
PCT/IB1996/000946 1995-09-15 1996-09-13 Re-usable light bulb WO1997010611A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE69628655T DE69628655T2 (en) 1995-09-15 1996-09-13 REUSABLE LAMP
EP96929464A EP0850488B1 (en) 1995-09-15 1996-09-13 Re-usable light bulb
BR9610544A BR9610544A (en) 1995-09-15 1996-09-13 Reusable lamp bulb
US09/043,198 US6054812A (en) 1995-09-15 1996-09-13 Multifilament light bulb
JP09511798A JP2000516758A (en) 1995-09-15 1996-09-13 Reusable light bulb
AU73000/96A AU717500B2 (en) 1995-09-15 1996-09-13 Re-usable light bulb
CA002232057A CA2232057C (en) 1995-09-15 1996-09-13 Re-usable light bulb

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
ZA957762 1995-09-15
ZA958187 1995-09-29
ZA96/1034 1996-02-09
ZA95/7762 1996-02-09
ZA95/8178 1996-02-09
ZA961034 1996-02-09

Publications (1)

Publication Number Publication Date
WO1997010611A1 true WO1997010611A1 (en) 1997-03-20

Family

ID=27420990

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/000946 WO1997010611A1 (en) 1995-09-15 1996-09-13 Re-usable light bulb

Country Status (1)

Country Link
WO (1) WO1997010611A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB427809A (en) * 1933-10-31 1935-04-30 John Ismay & Sons Ltd Improvements in or relating to incandescent electric lamps of the multifilament type
GB430431A (en) * 1933-12-19 1935-06-19 John Ismay & Sons Ltd Improvements in or relating to electric lamps of the multi-filament type
GB439612A (en) * 1935-04-10 1935-12-10 Ensign Lamps Ltd Improvements in and relating to caps for incandescent electric lamps
GB467271A (en) * 1935-12-17 1937-06-15 Lewis Charles Edwards Improvements relating to multiple-filament electric lamps
GB472356A (en) * 1935-10-11 1937-09-22 Belge Des Lampes A Incandescen Improvements in or relating to electric incandescent lamps
GB486234A (en) * 1937-03-13 1938-06-01 Tungstalite Ltd Improvements in or relating to electric lamps
GB503546A (en) * 1937-10-09 1939-04-11 Vestric Lamp Company Ltd Improvements relating to electric incandescent lamps
RU2007781C1 (en) * 1990-11-06 1994-02-15 Михаил Васильевич Калмыков Filament lamp

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB427809A (en) * 1933-10-31 1935-04-30 John Ismay & Sons Ltd Improvements in or relating to incandescent electric lamps of the multifilament type
GB430431A (en) * 1933-12-19 1935-06-19 John Ismay & Sons Ltd Improvements in or relating to electric lamps of the multi-filament type
GB439612A (en) * 1935-04-10 1935-12-10 Ensign Lamps Ltd Improvements in and relating to caps for incandescent electric lamps
GB472356A (en) * 1935-10-11 1937-09-22 Belge Des Lampes A Incandescen Improvements in or relating to electric incandescent lamps
GB467271A (en) * 1935-12-17 1937-06-15 Lewis Charles Edwards Improvements relating to multiple-filament electric lamps
GB486234A (en) * 1937-03-13 1938-06-01 Tungstalite Ltd Improvements in or relating to electric lamps
GB503546A (en) * 1937-10-09 1939-04-11 Vestric Lamp Company Ltd Improvements relating to electric incandescent lamps
RU2007781C1 (en) * 1990-11-06 1994-02-15 Михаил Васильевич Калмыков Filament lamp

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