US3678319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament support for tubular lamp
Assignee: US Philips Corp
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Filing: 1971-08-30
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Granted: 1972-07-18
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Expires: 1991-08-30
Abstract
Abstract The invention relates to an electric filament lamp having a tubular envelope, in which a coiled coil filament is stretched. The filament is supported by a wire support a coiled part of which encloses a part of one turn of the filament, the inner diameter of said coiled part being maximum 1.5 times the outer diameter of the turn, and the length being minimum 1.5 times said outer diameter.
Inventors
- 👤 Victor Rosallie Notelteirs
- 👤 Eduard Josef Philomena Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:19
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18; H01K1/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
An electric filament lamp comprising a tubular envelope which is sealed at its ends by means of pinches and comprises a helically wound filament extending in the longitudinal direction of the envelope, said filament being secured with its ends in the pinches of the envelope and being supported by a metal supporting wire in at least one place between the pinches of the envelope, the turns of said fila-ment being each constituted by a number of helically extending wire windings, a part of the supporting wire cooperating with wire windings which occur in a part of only one turn of the filament, characterized in that the supporting wire surrounds the wire windings occuring in a part of one turn of the filament with a coiled part the inner diameter of which is at most 1.5 times the outer diameteR of the wire windings, and the longitudinal dimension of which is minimum 1.5 times said outer diameter.
Claim 2
Dependent Claim
156 words
An electric filament lamp comprising a tubular envelope which is sealed at its ends by means of pinches and comprises a helically wound filament extending in the longitudinal direction of the envelope, said filament being secured with its ends in the pinches of the envelope and being supported by a metal supporting wire in at least one place between the pinches of the envelope, the turns of said fila-ment being each constituted by a number of helically extending wire windings, a part of the supporting wire cooperating with wire windings which occur in a part of only one turn of the filament, characterized in that the supporting wire surrounds the wire windings occuring in a part of one turn of the filament with a coiled part the inner diameter of which is at most 1.5 times the outer diameteR of the wire windings, and the longitudinal dimension of which is minimum 1.5 times said outer diameter.
Claim 3
Dependent Claim
56 words
An electric filament lamp as claimed in claim 1, in which the directions of winding of the coiled part of the support and of the windings of the filament enclosed by said part are the same, characterized in that the pitch of the coiled part is smaller than that of the windings enclosed by said part.
Claim 4
Dependent Claim
69 words
An electric filament lamp as claimed in claim 1, characterized in that the end of the support remote from the filament is formed as a barb which hooks behind the edge of an aperture in the wall of the envelope, into which aperture the sealed exhaust tube opens which projects laterally from the envelope, the inner diameter of said exhaust tube being larger than the diameter of the aperture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |