Patent US3626236A successfully refreshed from Google Patents.
US3626236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-halogen lamps
Assignee: Thorn Lighting Ltd
•
Filing: 1970-02-25
•
Granted: 1971-12-07
•
Expires: 1990-02-25
Abstract
Abstract A tungsten halogen incandescent lamp having two planar filaments which are spaced further apart at one pair of edges of the planes than at the other pair, one filament being of lower efficiency than the other filament so that in use the lamp can be orientated with the filaments further apart at the upper edges and the filament of lower efficiency uppermost whereby the temperature gradient between the top and the bottom of the filaments is reduced.
Inventors
- 👤 Kenneth Buckley Robinson
- 👤 Henry Alfred Fenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:29
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18; H01K1/52; H01K1/54
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A tungsten-halogen incandescent lamp comprising: an envelope; a fill of inert gas and halogen; lamp terminals; two planar tungsten filaments located one in front of the other inside the envelope, the spacing betwEen the said filaments being greater at one pair of edges of the planes of the filaments than at the opposite pair of edges; and lead-in conductors connecting the filaments to the terminals.
Claim 2
Dependent Claim
65 words
A tungsten-halogen incandescent lamp comprising: an envelope; a fill of inert gas and halogen; lamp terminals; two planar tungsten filaments located one in front of the other inside the envelope, the spacing betwEen the said filaments being greater at one pair of edges of the planes of the filaments than at the opposite pair of edges; and lead-in conductors connecting the filaments to the terminals.
Claim 3
Dependent Claim
19 words
A lamp as claimed in claim 1 wherein one of the filaments is of lower efficiency than the other.
Claim 4
Dependent Claim
17 words
A lamp according to claim 2 in which the filament of lower efficiency is the rear filament.
Claim 5
Dependent Claim
18 words
A lamp according to claim 1 in which the filaments are made up of parallel coiled wire sections.
Claim 6
Dependent Claim
15 words
A lamp according to claim 4 in which the sections are suspended between bridge means.
Claim 7
Dependent Claim
14 words
A lamp according to claim 5 in which the bridge means are of silica.
Claim 8
Dependent Claim
19 words
A lamp according to claim 5 including hooks, the sections being suspended from the bridge means by the hooks.
Claim 9
Dependent Claim
26 words
A lamp according to claim 5 in which the lead-in conductors are metal rods, the bridge means being supported in the envelope by the metal rods.
Claim 10
Dependent Claim
47 words
A lamp according to claim 8 including coils and corresponding tubes the coils being mounted at one end of each of the rods and engaging the corresponding tubes which are provided on the inside of the envelope, the rods passing through and being sealed in the envelope.
Claim 11
Dependent Claim
22 words
A lamp according to claim 1 in which the filaments are further apart at the edges most distant from the lamp terminals.
Claim 12
Dependent Claim
13 words
A lamp according to claim 10 oriented during use with said edges uppermost.
Claim 13
Dependent Claim
16 words
A lamp according to claim 2 oriented during use with the filament of lower efficiency uppermost.
Claim 14
Dependent Claim
25 words
A lamp according to claim 1 in which each filament is made up of filament sections which lie substantially in the plane of the filament.
References Cited (Backward Citations)
US1483449A
Cited
US3441774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |