Patent US3848151A successfully refreshed from Google Patents.
US3848151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic envelope lamp having metal foil inleads
Assignee: General Electric Co
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Filing: 1973-10-23
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Granted: 1974-11-12
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Expires: 1993-10-23
Abstract
Abstract An electric lamp comprising an alumina ceramic tube having its ends closed by ceramic plugs. The plugs are sealed in place by fused sealing material and thin foils of a metal non-reactive with the lamp filling are embedded in the sealing material to serve as inleads. The foils may be made of molybdenum or other metal having a coefficient of expansion appreciably different from that of polycrystalline alumina and are thin enough to deform without rupturing or shaling of the sealing material through the temperature range of interest.
Inventors
- 👤 C Mcvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:35
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; H01J61/366
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
AN ELECTRIC DISCHARGE LAMP COMPRISING: AN ENVELOPE FORMED OF CRYSTALLINE ALUMINA CERAMIC TUBING; CERAMIC CLOSURE PIECES AT THE ENDS OF THE TUBING SEALED IN PLACE BY A FUSED SEALING MATERIAL; A LIGHT-EMITTING FILLING WITHIN SAID ENVELOPE AND ELECTRODES IN THE ENDS THEREOF; AND INLEADS CONNECTED TO SAID ELECTRODES AND COMPRISING THIN METAL FOILS EXTENDING THROUGH NARROW APERTURES NEXT TO
Claim 2
Dependent Claim
59 words
AN ELECTRIC DISCHARGE LAMP COMPRISING: AN ENVELOPE FORMED OF CRYSTALLINE ALUMINA CERAMIC TUBING; CERAMIC CLOSURE PIECES AT THE ENDS OF THE TUBING SEALED IN PLACE BY A FUSED SEALING MATERIAL; A LIGHT-EMITTING FILLING WITHIN SAID ENVELOPE AND ELECTRODES IN THE ENDS THEREOF; AND INLEADS CONNECTED TO SAID ELECTRODES AND COMPRISING THIN METAL FOILS EXTENDING THROUGH NARROW APERTURES NEXT TO
Claim 3
Dependent Claim
23 words
A lamp as in claim 1 wherein the foil inlead extends between the ceramic closure piece and the wall of the ceramic tubing.
Claim 4
Dependent Claim
39 words
A lamp as in claim 1 wherein the closure piece is a ceramic plug sealed in place within the end of the ceramic tubing, and the foil inlead extends between the plug and the wall of the ceramic tubing.
Claim 5
Dependent Claim
57 words
An electric discharge lamp as in claim 1 wherein a metal foil supporter for said electrode is included in said envelope close to said ceramic closure piece, said supporter being pan-like in form and having an edge wall which resiliently engages the wall of the ceramic tubing, said electrode being fastened to said supporter and supported thereby.
Claim 6
Dependent Claim
40 words
An electric discharge lamp as in claim 1 wherein a plurality of metal foils circumferentially spaced around the closure pieces are sealed into each end of the envelope and have axially retroverted inner ends to which the electrodes are attached.
Claim 7
Dependent Claim
104 words
An electric discharge lamp comprising: an envelope formed of crystalline alumina ceramic tubing; ceramic plugs closing the ends of the tubing and sealed in place by a fused sealing material; 1 a light-emitting filling within said envelope; electrodes comprising a metal structure at the distal end of a tungsten shank located in the ends of said envelope; and inleads comprising thin metal foils extending through narrow apertures between the ceramic plugs and the wall of the ceramic tubing, said foils being wetted by and embedded in said sealing material, the inner ends of said foils being attached to the proximate ends of said shanks.
Claim 8
Dependent Claim
104 words
An electric discharge lamp comprising: an envelope formed of crystalline alumina ceramic tubing; ceramic plugs closing the ends of the tubing and sealed in place by a fused sealing material; 1 a light-emitting filling within said envelope; electrodes comprising a metal structure at the distal end of a tungsten shank located in the ends of said envelope; and inleads comprising thin metal foils extending through narrow apertures between the ceramic plugs and the wall of the ceramic tubing, said foils being wetted by and embedded in said sealing material, the inner ends of said foils being attached to the proximate ends of said shanks.
Claim 9
Dependent Claim
60 words
An electric discharge lamp as in claim 6 wherein a metal foil supporter for said electrode Is located within said envelope close to said ceramic plug, said supporter being pan-like in form and having an edge wall which resiliently engages the wall of the ceramic tubing, said electrodes shank passing through an aperture is said supporter and being fastened thereto.
Claim 10
Dependent Claim
31 words
An electric lamp as in claim 7 including at one end an additional metal foil having an auxiliary starting electrode attached thereto and extending through an opening in said electrode supporter.
Claim 11
Dependent Claim
45 words
An electric discharge lamp as in claim 6 wherein a plurality of metal foils circumferentially spaced around the ceramic plugs are sealed into each end of the envelope and have axially retroverted inner ends to which the proximate ends of the electrode shanks are attached.
Claim 12
Dependent Claim
20 words
An electric discharge lamp as in claim 6 wherein the ceramic plugs have shallow notched sectors accommodating the inlead foils.
References Cited (Backward Citations)
US3363134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |