Patent US3622947A successfully refreshed from Google Patents.
US3622947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp base extension
Assignee: GTE Sylvania Inc
•
Filing: 1970-09-02
•
Granted: 1971-11-23
•
Expires: 1990-09-02
Abstract
Abstract A lamp base extension for halogen-type lamps where the base to filament length is increased without enlarging the size of the lamp envelope. The extended base comprises a preformed ceramic bridge spaced between an extension skirt and a screw base. The ceramic bridge is formed with reduced end portions and spaced slots about its periphery. The metal base and extension skirt are fitted over each reduced end of the bridge and the edges of the skirt and base are crimped into the slots of the bridge. This forms an extended base that provides an increased light center length for the lamp without enlarging the lamp envelope or the utilization of an expensive glass insulation bridge.
Inventors
- 👤 Robert M Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:11
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
A base assembly for a lamp having an hermetically sealed lamp envelope with a screw adapter fitted to an end thereof, a filament structure including a filament disposed in said lamp envelope and a pair of lead-In wires extending from said lamp envelope, said base assembly comprising: a preformed ceramic bridge, said bridge having reduced end portions, a central orifice and spaced slots about its periphery; a metal screw base having a contact button insulated from its main body portion; a metal extension skirt provided with the screw impressions at one end; said metal extension skirt is fitted over one of the reduced portions of said bridge and its edges are deformed into the slots of said bridge, the other end of said skirt is fitted to said screw adapter of said envelope; said lead-in wires of said envelope extend through the said orifice of said bridge; said metal screw base is fitted over the other reduced end of said ceramic bridge, wherein the ends of said lead-in wires are directed to their conductive points on said base, the edges of said base are deformed into said slots of said bridge thereby forming an extended length between the center of the said filament structure and the bottom of said screw base.
Claim 2
Dependent Claim
211 words
A base assembly for a lamp having an hermetically sealed lamp envelope with a screw adapter fitted to an end thereof, a filament structure including a filament disposed in said lamp envelope and a pair of lead-In wires extending from said lamp envelope, said base assembly comprising: a preformed ceramic bridge, said bridge having reduced end portions, a central orifice and spaced slots about its periphery; a metal screw base having a contact button insulated from its main body portion; a metal extension skirt provided with the screw impressions at one end; said metal extension skirt is fitted over one of the reduced portions of said bridge and its edges are deformed into the slots of said bridge, the other end of said skirt is fitted to said screw adapter of said envelope; said lead-in wires of said envelope extend through the said orifice of said bridge; said metal screw base is fitted over the other reduced end of said ceramic bridge, wherein the ends of said lead-in wires are directed to their conductive points on said base, the edges of said base are deformed into said slots of said bridge thereby forming an extended length between the center of the said filament structure and the bottom of said screw base.
Claim 3
Dependent Claim
26 words
The base assembly according to claim 1 wherein said ceramic bridge is provided with a raised portion that separates and insulates said skirt from said base.
Claim 4
Dependent Claim
26 words
The base assembly according to claim 1 wherein said lead-in wires of said lamp are directed through the orifice of said ceramic bridge to said base.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |