Patent US3631379A successfully refreshed from Google Patents.
US3631379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent filament lamps
Assignee: British Lighting Industries Ltd
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Filing: 1969-05-23
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Granted: 1971-12-28
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Expires: 1989-05-23
Abstract
Abstract An incandescent filament lamp having an envelope closed with a wedge-shaped pinch seal and a cap disposed about the seal. The cap is closed by a plug of vitritelike material and an extension of said plug provides a seating structure for the seal.
Inventors
- 👤 John Willoughby Thomas Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:57
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/58; H01J5/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
An incandescent filament lamp comprising an envelope having a wedge-shaped pinch seal at one end thereof, the thin end of the wedge being along an edge at the end remote from the filament; a pair of terminal wires sealed through said pinch seal in spacedapart relationship to one another and extending beyond said seal; said terminal wires being connected at their inner ends to said filament; a cap disposed about said seal having a base closed by a plug of vitritelike material; an extension of said plug of vitritelike material forming seating structures disposed within said cap and abutting the sides of said seal, said terminal wires being connected to said cap whereby said seal is held against said seating structures and said envelope is prevented from moving axially relative to said cap.
Claim 2
Dependent Claim
133 words
An incandescent filament lamp comprising an envelope having a wedge-shaped pinch seal at one end thereof, the thin end of the wedge being along an edge at the end remote from the filament; a pair of terminal wires sealed through said pinch seal in spacedapart relationship to one another and extending beyond said seal; said terminal wires being connected at their inner ends to said filament; a cap disposed about said seal having a base closed by a plug of vitritelike material; an extension of said plug of vitritelike material forming seating structures disposed within said cap and abutting the sides of said seal, said terminal wires being connected to said cap whereby said seal is held against said seating structures and said envelope is prevented from moving axially relative to said cap.
Claim 3
Dependent Claim
25 words
A lamp as claimed in claim 1, wherein said pinch seal tapers on at least one side from its center towards at least one edge.
Claim 4
Dependent Claim
38 words
A lamp as claimed in claim 1, wherein said seating structures has portions of a shape complementary to the shape of said seal whereby a face to face contact is maintained between said seal and said seating structure.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |