# Electrical Wire with a Heat-Resistant Plastic Coating

> This patent describes an electrical wire coated with a specific plastic blend, a copolymer of tetrafluoroethylene and perfluoro(propyl vinyl ether), designed to withstand high temperatures and improve durability.

- **Patent:** US 12738390
- **Original title:** Coated electrical wire
- **Granted:** 2026
- **Status:** Active
- **Times cited:** 0
- **Field:** materials, electrical, manufacturing, automotive, aerospace, telecommunications

## What it does

This patent details an electrical wire featuring a core wire surrounded by a special coating layer. This coating is made from a copolymer, which is a type of plastic built from two different molecular units: tetrafluoroethylene and perfluoro(propyl vinyl ether). The patent specifies precise characteristics for this copolymer: the perfluoro(propyl vinyl ether) unit must make up 4.8 to 5.5% of the total monomer units by mass. Additionally, the plastic's melt flow rate at 372°C must be between 28.0 and 37.0 g/10 min, and it needs to have 50 or fewer functional groups per 10^6 main-chain carbon atoms. For example, this type of wire could be used in aircraft engines where wiring must endure extreme heat and harsh chemicals.

## What it does NOT cover

- Does not cover electrical wires coated with materials other than the specified tetrafluoroethylene and perfluoro(propyl vinyl ether) copolymer.
- Does not cover coatings where the perfluoro(propyl vinyl ether) unit content is outside the 4.8 to 5.5% by mass range.
- Does not cover coatings where the copolymer's melt flow rate at 372°C is outside the 28.0 to 37.0 g/10 min range.
- Does not cover coatings where the copolymer has more than 50 functional groups per 10^6 main-chain carbon atoms.
- Does not cover non-electrical wires, such as optical fibers, regardless of their coating.

## The clever bit

The novelty lies in the precise combination of the tetrafluoroethylene and perfluoro(propyl vinyl ether) copolymer, specifically optimized for its composition, melt flow rate, and low number of functional groups. This exact formulation likely provides a unique balance of high-temperature performance, chemical resistance, and ease of manufacturing for electrical wire coatings.

## Real-world examples

1. Aerospace wiring harnesses
2. Automotive engine compartment wiring
3. Industrial machinery control cables
4. High-temperature sensor wiring
5. Medical device internal wiring

## Why it matters

High-performance electrical wires are crucial for safety and reliability in demanding environments like aerospace, automotive, and industrial settings. This patent's specific formulation for a fluoropolymer coating likely offers enhanced properties, such as superior heat resistance, chemical inertness, and improved processability, compared to general-purpose wire coatings. Such advancements contribute to more durable and safer electrical systems in critical applications.

## Frequently asked questions

### What does Electrical Wire with a Heat-Resistant Plastic Coating cover?

This patent describes an electrical wire coated with a specific plastic blend, a copolymer of tetrafluoroethylene and perfluoro(propyl vinyl ether), designed to withstand high temperatures and improve durability.

### When does this patent expire?

This patent is expected to expire on September 15, 2046, when the invention enters the public domain.

### What problem does this patent solve?

High-performance electrical wires are crucial for safety and reliability in demanding environments like aerospace, automotive, and industrial settings. This patent's specific formulation for a fluoropolymer coating likely offers enhanced properties, such as superior heat resistance, chemical inertness, and improved processability, compared to general-purpose wire coatings. Such advancements contribute to more durable and safer electrical systems in critical applications.

### What does this patent NOT cover?

Does not cover electrical wires coated with materials other than the specified tetrafluoroethylene and perfluoro(propyl vinyl ether) copolymer.

**Full plain-English explainer:** https://patentbrief.org/patent/us/12738390/coated-electrical-wire

**Original patent:** https://patents.google.com/patent/US12738390

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._