Patent US4672268A successfully refreshed from Google Patents.
US4672268A
Expired / Lapsed
US
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Gas discharge lamp with sintered cathode
Assignee: Heimann GmbH
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Filing: 1986-01-03
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Granted: 1987-06-09
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Expires: 2006-01-03
Abstract
Abstract A gas discharge lamp such as a flashbulb consisting of an anode and a cathode in a transparent housing, the cathode being composed of a sintered member made up of powdered titanium (Ti), and vanadium (V), as well as at least one of the other metals tantalum (Ta) or niobium (Nb), the particles having a grain size of no more than 50 microns, and the Ti being present in a precentage of at least 40% by weight, and the V content being at least 10% by weight.
Inventors
- 👤 Ingo Duenisch
- 👤 Michael Lausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A gas discharge lamp comprising: a gas-filled, light-permeable housing, an anode in said housing and a cathode in said housing spaced from said anode, said cathode being a sintered mixture of metal powders having a grain size of not more than 50 microns, said metal powders including Ti and V, and at least one of the metals Ta and Nb, said mixture containing at least 40% by weight Ti and at least 10% by weight V.
Claim 2
Dependent Claim
76 words
A gas discharge lamp comprising: a gas-filled, light-permeable housing, an anode in said housing and a cathode in said housing spaced from said anode, said cathode being a sintered mixture of metal powders having a grain size of not more than 50 microns, said metal powders including Ti and V, and at least one of the metals Ta and Nb, said mixture containing at least 40% by weight Ti and at least 10% by weight V.
Claim 3
Dependent Claim
27 words
A gas discharge lamp according to claim 1: wherein said mixture contains from 50 to 60% Ti, from 10 to 30% V, and the balance essentially Ta.
Claim 4
Dependent Claim
27 words
A gas discharge lamp according to claim 1: wherein said mixture contains from 40 to 50% Ti, from 10 to 30% V, and the balance essentially Nb.
Claim 5
Dependent Claim
30 words
A gas discharge lamp according to claim 1: wherein said mixture contains from 40 to 50% Ti, from 10 to 30% V, about 10% Ta, and the balance essentially Nb.
Claim 6
Dependent Claim
22 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 50% Ti, about 20% Ta, and about 30% V.
Claim 7
Dependent Claim
22 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 50% Ti, about 30% Ta, and about 20% V.
Claim 8
Dependent Claim
22 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 40% Ti, about 30% Nb, and about 30% V.
Claim 9
Dependent Claim
22 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 40% Ti, about 40% Nb, and about 20% V.
Claim 10
Dependent Claim
25 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 40% Ti, about 10% Ta, about 20% Nb, and about 30% V.
Claim 11
Dependent Claim
25 words
A gas discharge lamp according to claim 1: wherein said mixture contains about 50% Ti, about 10% Ta, about 30% Nb, and about 10% V.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |