# US 5,345,144 A · Lamp with internally pressed fuse

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,345,144 A
- Document ID: US5345144A
- Status: Granted
- Kind: A
- Application number: 07/930,055
- Filed: 1992-08-14
- Granted: 1994-09-06
- Earliest claimed: 1992-08-14
- Assignees: GTE Products Corporation
- Inventors: Christopher E. Mahonski; Raymond T. Fleming
- Web page: https://patentgrep.com/patent/US5345144A

## CPC

- H01J 9/323: {Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device}
- H01J 61/56: One or more circuit elements structurally associated with the lamp
- H01K 1/66: with built-in fuse
- H01K 3/00: Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof (manufacture of vessels from glass C03B)
- H01K 3/20: Sealing-in wires directly into the envelope
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00)

## Abstract

A press sealed lamp with an internally pressed fuse is disclosed. The filament structure is conveniently formed so the fuse links across a looped section of the initial filament structure. The loop structure provides strength to the fused filament structure prior to sealing. After the lamp is sealed, a portion of the exposed loop is trimmed, thereby limiting the electrical connection to the path through the fuse.

## Claims

### Claim 1

A lamp with an internally pressed fuse comprising:
a) an envelope having an internal surface defining an enclosed volume, and a first press seal; and
b) a filament structure having a filament positioned in the enclosed volume, an inner lead extending from a first end of the filament into the first press seal electrically coupled in series to a fuse pressed in the first press seal, the fuse being electrically coupled in series to a final lead extending from the first press seal to the exterior of the lamp, the filament being further connected through a second filament end to the exterior of the lamp for electrical connection.

### Claim 2 (depends on 1)

The lamp in claim 1, wherein the envelope includes a first press seal and a second press seal.

### Claim 3 (depends on 1)

The lamp in claim 1, wherein the filament structure includes a seal foil sealed to the envelope and electrically coupled in series between the filament and the fuse.

### Claim 4

A lamp with an internally pressed fuse comprising:
a) a quartz envelope having an internal surface defining an enclosed volume, and a first press seal; and
b) a filament structure having a filament positioned in the enclosed volume, an inner lead extending from a first end of the filament into the first press seal, electrically coupled in series to a seal foil sealed in the first press seal and electrically connected in series to a fuse pressed in the first press seal, the fuse being electrically connected in series to a final lead extending from the first press seal to the exterior of the lamp, the filament being further connected through a second filament end to the exterior of the lamp for electrical connection.

### Claim 5

A lamp with an internally pressed fuse comprising:
a) an envelope having an internal surface defining an enclosed volume, and a first press seal; and
b) a filament structure having a filament positioned in the enclosed volume, electrically coupled in series to a fuse pressed in the first press seal, the fuse being electrically and mechanically coupled in series to a final lead extending from the first press seal to the exterior of the lamp, the filament being further connected through a second filament end to the exterior of the lamp for electrical connection.