US4734614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp provided with an interference filter
Assignee: US Philips Corp
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Filing: 1986-06-05
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Granted: 1988-03-29
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Expires: 2006-06-05
Abstract
Abstract The electric lamp according to the invention has a lamp vessel (1) of glass having an SiO 2 content of at least 95% by weight, in which an electric element (3) is arranged. The lamp vessel is coated with an interference filter (5) of alternating layers of SiO 2 and Nb 2 O 5 .
Inventors
- 👤 Gijsbert Kuus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:18
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282; H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
An electric lamp provided with a glass lamp vessel sealed in a vacuum-tight manner and having an SiO 2 content of at least 95% by weight, current supply conductors extending through the wall of the lamp vessel to an electric element arranged in the lamp vessel and an interference filter of alternating layers consisting essentially of SiO 2 and consisting essentially of niobium oxide provided on the glass lamp vessel.
Claim 2
Dependent Claim
70 words
An electric lamp provided with a glass lamp vessel sealed in a vacuum-tight manner and having an SiO 2 content of at least 95% by weight, current supply conductors extending through the wall of the lamp vessel to an electric element arranged in the lamp vessel and an interference filter of alternating layers consisting essentially of SiO 2 and consisting essentially of niobium oxide provided on the glass lamp vessel.
Claim 3
Dependent Claim
21 words
The electric lamp of claim 1, wherein an interference filter is provided on the inner surface of the glass lamp vessel.
References Cited (Backward Citations)
US3962062A
Cited
US4652789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |