US3600053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-ended filament lamps
Assignee: Thorn Lighting Ltd
•
Filing: 1969-12-29
•
Granted: 1971-08-17
•
Expires: 1989-12-29
Abstract
Abstract A single-ended tungsten halogen lamp having an envelope, a press seal closing one end of the envelope, two filament sections each having one end separately supported in said press seal, a common electrically conductive support for the other ends of said filament sections, and a tip in the wall of said envelope, said common support being embedded in said tip and said filament sections being secured in electrically conductive relation to said support. During manufacture the filament assembly is supported by a fine wire attached to the support and extending through the exhaust tube. On closure of the exhaust tube the tip is formed around the support and the fine wire is burnt through.
Inventors
- 👤 Victor Mark Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:47
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
In a method of manufacturing a single-ended tungsten halogen lamp including a halogen-containing envelope, a press seal closing one end of the envelope, two filament sections within the envelope, each having one end separately supported in the press seal and a common electrically conductive support connecting the other ends of the filament sections, the steps which comprise: attaching one end of a noble metal wire to the common support; attaching a stiffer wire to the other end of the noble wire; inserting the wires through an exhaust tube of the envelope, one end of the stiffer wire protruding beyond the exHaust tube; holding the filament sections in tension while the press seal is formed; melting the exhaust tube adjacent the envelope to reform it around the common support; and heating the exhaust tube around the noble wire to melt the noble wire and seal the exhaust tube.
Claim 2
Dependent Claim
147 words
In a method of manufacturing a single-ended tungsten halogen lamp including a halogen-containing envelope, a press seal closing one end of the envelope, two filament sections within the envelope, each having one end separately supported in the press seal and a common electrically conductive support connecting the other ends of the filament sections, the steps which comprise: attaching one end of a noble metal wire to the common support; attaching a stiffer wire to the other end of the noble wire; inserting the wires through an exhaust tube of the envelope, one end of the stiffer wire protruding beyond the exHaust tube; holding the filament sections in tension while the press seal is formed; melting the exhaust tube adjacent the envelope to reform it around the common support; and heating the exhaust tube around the noble wire to melt the noble wire and seal the exhaust tube.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |