Patent US3609437A successfully refreshed from Google Patents.
US3609437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge lamp comprising container of densely sintered aluminum oxide
Assignee: US Philips Corp
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Filing: 1968-03-08
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Granted: 1971-09-28
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Expires: 1988-03-08
Abstract
Abstract Electric gas discharge lamp having an envelope of densely sintered aluminum oxide and employing an alkali metal vapor as the discharge medium. A current supply member for an electrode assembly is sealed in each end of the envelope by means of a sealing element of densely sintered aluminum oxide which is sintered to the inner wall of the envelope and is provided with an aperture into which a cylindrical current lead-in supporting at one end an electrode assembly is secured in a gastight manner. The current lead-in member is provided with a cover for the envelope which is sealed to the latter by a sealing glass having a melting point higher than 800* C. and lower than the melting point of the aluminum oxide or the current supply member.
Inventors
- 👤 Taeke Tol
- 👤 Bertus De Vrijer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:25
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; C04B37/003; C04B37/005; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/50; C04B2237/62; C04B2237/76; C04B2237/765; C04B2237/84; C04B2237/88
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
An electric gas discharge lamp as claimed in claim 1, wherein the cover projects beyond the cylindrical part and a rim of sealing glass is provided in the corner joint between said two parts.
Claim 2
Dependent Claim
27 words
An electric gas discharge lamp as claimed in claim 1 wherein the discharge space contains at least one alkali metal, mercury and at least one rare gas.
Claim 3
Dependent Claim
22 words
An electric gas discharge lamp as claimed in claim 3, wherein the alkali metal is sodium and The rare gas is xenon.
Claim 4
Dependent Claim
18 words
An electric discharge lamp as claimed in claim 1, wherein the current lead-in member consists substantially of niobium.
Claim 5
Dependent Claim
67 words
An electric gas discharge lamp as claimed in claim 1, in which the envelope of the discharge space is arranged within an outer bulb and at least one tubular current lead-in member which is open on the side remote from the discharge space, a pinlike supporting member being arranged some clearance in the tubular current lead-in member, the supporting member being rigidly secured to the outer bulb.
Claim 6
Dependent Claim
49 words
An electric gas discharge lamp as claimed in claim 6, wherein a flexible wire is connected at one end in an electrically conductive manner to a terminal which is secured in the outer bulb, and is connected also in an electrically conductive manner to the tubular current lead-in member.
Claim 7
Dependent Claim
20 words
An electric gas discharge lamp as claimed in claim 6 wherein the outer bulb is filled with an inert gas.
Claim 8
Dependent Claim
22 words
An electric gas discharge lamp as claimed in claim 7 wherein the terminal is secured in a pinch in the outer bulb.
Claim 9
Dependent Claim
16 words
An electric gas discharge lamp as claimed in claim 6, wherein the outer bulb is evacuated.
Claim 10
Dependent Claim
24 words
An electric gas discharge lamp as claimed in claim 1, wherein the lead-in member is tubular having a closed end in the discharge space.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |