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US3555342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-ended incandescent projection lamp having dual series-connected filaments and an integral gripping cap
Assignee: Philips North America LLC
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Filing: 1969-02-11
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Granted: 1971-01-12
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Expires: 1989-02-11
Abstract
Abstract A pair of elongated filaments, preferably of coiled coil construction, are suspended in side-by-side longitudinallyextending relationship within a tubular quartz envelope that contains a halogen gas and is closed at each end by a press seal. The filaments are connected in series with each other by a shortcircuiting conductor that is located either within or exterior of the envelope. The press seal which constitutes the top of the envelope is provided with a cap of insulating material which serves both as a protective enclosure for that end of the lamp and means for gripping the lamp during insertion and withdrawal from its socket.
Inventors
- 👤 Thomas Mcfall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/16; H01K1/00; H01K1/42; H01K1/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
206 words
A single-ended electric incandescent lamp comprising: an elongated tubular envelope that is hermetically closed at each end by a press seal; a pair of elongated filaments disposed in side-by-side longitudinally-extending relationship within said envelope; means holding said filaments in such position comprising (a) a pair of spaced lead-in conductor assemblies that are fastened to adjacent ends of said filaments and extend through one of said press seals, and (b) a pair of spaced rigid support members that are fastened to the opposite ends of said filaments and are anchored in the other of said press seals; a base member attached to the press seal from which said lead-in conductor assemblies extend; a pair of terminals carried by said base member and connected to the protruding ends of said pair of lead-in conductor assemblies; means short-circuiting the ends of said filaments that are fastened to said support members and thereby connecting said filaments in series with one another and the respective terminals; and a cap fastened to and at least partially enclosing the press seal opposite said base member and thereby providing a protective closure and means at that end of the envelope for gripping the lamp and inserting it into and removing it from a socket.
Claim 2
Dependent Claim
206 words
A single-ended electric incandescent lamp comprising: an elongated tubular envelope that is hermetically closed at each end by a press seal; a pair of elongated filaments disposed in side-by-side longitudinally-extending relationship within said envelope; means holding said filaments in such position comprising (a) a pair of spaced lead-in conductor assemblies that are fastened to adjacent ends of said filaments and extend through one of said press seals, and (b) a pair of spaced rigid support members that are fastened to the opposite ends of said filaments and are anchored in the other of said press seals; a base member attached to the press seal from which said lead-in conductor assemblies extend; a pair of terminals carried by said base member and connected to the protruding ends of said pair of lead-in conductor assemblies; means short-circuiting the ends of said filaments that are fastened to said support members and thereby connecting said filaments in series with one another and the respective terminals; and a cap fastened to and at least partially enclosing the press seal opposite said base member and thereby providing a protective closure and means at that end of the envelope for gripping the lamp and inserting it into and removing it from a socket.
Claim 3
Dependent Claim
90 words
The incandescent lamp of claim 1 wherein: said support members comprise integral parts of a second pair of spaced lead-in conductor assemblies that are embedded in and extend through the associated press seal; said short-circuiting means comprises a conductor that is connected to the protruding ends of said second pair of lead-in conductor assemblies and is thus located outside of the lamp envelope; and said closure-and-gripping cap is composed of insulating material and encloses the protruding ends of said second pair of lead-in conductor assemblies and the associated short-circuiting conductor.
Claim 4
Dependent Claim
40 words
The incandescent lamp of claim 1 wherein said short-circuiting means comprises a conductor that is connected to the ends of the filaments that are fastened to the support members and said short-circuiting conductor is thus located within the lamp envelope.
Claim 5
Dependent Claim
81 words
The incandescent lamp of claim 1 wherein: both of said filaments are of the coiled coil type and are suspended in substantially parallel relationship with one another on opposite sides of the envelope axis; said envelope is composed of quartz and contains a halogen gas; said base member and cap are composed of ceramic material and are attached to the respective press seals by cement; and said terminals comprise a pair of rigid pins that extend longitudinally from said base member.
Claim 6
Dependent Claim
119 words
The incandescent lamp of claim 4 wherein: said support members comprise wire inserts that extend into and are connected to the coiled legs of the respective coiled coil filaments and have their opposite ends connected to a pair of ribbon conductors that are embedded in the associated press seal; a pair of outer lead wires are connected to the respective ribbon conductors and are anchored in and extend beyond the associated press seal; said short-circuiting means comprises a conductor that is fastened to the protruding ends of said outer lead wires and said short-circuiting conductor is thus located outside the lamp envelope; and said cap encloses the protruding endS of said outer lead wires and the attached short-circuiting conductor.
Claim 7
Dependent Claim
76 words
The incandescent lamp of claim 4 wherein: said support members comprise wire inserts that extend into and are connected to the coiled legs of the respective coiled coil filaments and have their opposite ends embedded in the associated press seal; and said short-circuiting means comprises a conductor that is fastened to portions of the coiled legs of said filaments that are connected to said wire inserts so that said short-circuiting conductor is located within said envelope.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |