IP Library › Granted Patent US 12,565,971
Granted Patent B1
US 12,565,971 · App. 18/917,833 · Granted Mar 3, 2026

High-voltage plug-in light string with integrated LED bulbs and method of making thereof

Inventor: Zhumei Deng (Guangdong, CN)
Assignee: Dongguan Yongfeng Lighting Co., Ltd
F21S4/10F21Y2103/10F21Y2113/00F21Y2115/10
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Quick Facts
Patent No.
US 12,565,971
App. No.
18/917,833
Granted
Mar 3, 2026
Kind
B1
Abstract

A method of making a first light assembly of a string light is disclosed, the method includes providing a bulb, a first wire, and a second wire, each of the first and second wires has an exposed end; connecting the exposed ends of the first and second wires to the bulb; inserting an inner insert in a space between the first and second wires where the first and second wires converge; encapsulating the first and second wires using a heat shrink tube where the exposed ends of the first and second wires are connected to the bulb; and affixing a lamp holder around the bulb and a portion of the first and second wires and on top of the inner insert to secure at least a portion of the bulb within the lamp holder.

Claims (20)

1 . A method of making a first light assembly of a string light, the method comprising:

providing a bulb, a first wire, and a second wire, each of the first and second wires has an exposed end;

connecting the exposed ends of the first and second wires to the bulb;

inserting an inner insert in a space between the first and second wires where the first and second wires converge;

encapsulating the first and second wires using a heat shrink tube where the exposed ends of the first and second wires are connected to the bulb;

affixing a lamp holder around the bulb and a portion of the first and second wires and on top of the inner insert to secure at least a portion of the bulb within the lamp holder; and

affixing a lamp collar between an upper opening of the lamp holder and the bulb such that at least a part of the lamp collar is between the lamp holder and the bulb.

2 . The method of claim 1 , wherein the striped ends of the first and second wires are connected to the LED bulb by welding.

3 . The method of claim 1 , wherein the striped ends of the first and second wires are connected to the LED bulb by riveting metal connectors.

4 . The method of claim 1 , wherein the bulb is an LED bulb.

5 . The method of claim 1 , further comprising connected the first light assembly with a second light assembly in series to form a string light.

6 . The method of claim 5 , further comprising adding a front plug and a rear plug to the light string.

7 . The method of claim 1 , wherein the at least a part of the lamp collar is between an inner surface of the lamp holder and an outer surface of the bulb.

8 . A light assembly of a string light comprising:

a bulb;

a first wire and a second wire, each connected to the bulb in series;

an inner inserted in a space between the first and second wires where the first and second wires converge;

a heat shrink tube encapsulating the first and second wires where the exposed ends of the first and second wires are connected to the bulb;

a lamp holder affixed around the bulb and a portion of the first and second wires and on top of the inner insert to secure at least a portion of the bulb within the lamp holder; and

a lamp collar affixed between an upper opening of the lamp holder and the bulb such that at least a part of the lamp collar is between the lamp holder and the bulb.

Assignments (2)
CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME AND ADDRESS PREVIOUSLY RECORDED AT REEL: 70052 FRAME: 581. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT OF ASSIGNORS INTEREST. Recorded Dec 16, 2025
From: DENG, ZHUMEI
To: DONGGUAN YONGFENG LIGHTING CO., LTD
Reel/Frame 073937/0450 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 29, 2025
From: DENG, ZHUMEI
To: DONGGUAN YONGFENG LIGHT CO., LTD
Reel/Frame 070052/0581 →
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