Magnetic Window Defroster With Portable Heating Assemblies

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Solution Overview

Problem

Hunting blinds and small structures in cold climates face issues with window fogging and frosting due to moisture condensation, which existing solutions like wiping cause temporary problems and can alert game or leave scent traces.

Innovation Solution

A window defroster system using a portable power source and magnets to attach a heating element, such as a metal bar or heat sink with a heating strip, to radiate heat and defrost/defog windows without movement or scent, with optional thermostats for temperature control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If wiping is used to remove condensation, then visibility is temporarily improved, but the windows quickly fog or frost over again and wiping smears the windows decreasing visibility

Engineering Contradiction:

Improvevisibility through windowVSAvoidduration of window clarity

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent replaces the mechanical wiping action with a thermal field (heating element) to eliminate condensation and frost. The heating element applies heat directly to the window surface, preventing moisture condensation and maintaining clear visibility without the need for repeated mechanical intervention.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The heating element performs preliminary action by preventing condensation and frost formation before they occur. By maintaining the window surface temperature above the dew point, the system proactively prevents moisture accumulation, eliminating the need for reactive wiping actions.

Inventive Principle:

Principle #10Preliminary action

2Illumination intensity

If wiping is used to defrost windows, then frost is removed, but movement is displayed to passing game

Engineering Contradiction:

Improvevisibility through windowVSAvoiddisturbance to game

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical wiping actions with a thermal field (heating element) that silently and stationary eliminates frost and condensation. This substitution eliminates movement at the window surface, preventing game from detecting human presence while maintaining clear visibility.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Illumination intensity

If defrosting fluids are used, then window defrosting is achieved, but undesirable scent is left on the exterior of the enclosure

Engineering Contradiction:

Improvevisibility through windowVSAvoidscent on enclosure exterior

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces chemical defrosting fluids with a thermal field (heating element) that physically heats the window surface to prevent and eliminate condensation and frost. This substitution eliminates the introduction of foreign chemicals and associated scents that could alert game to human presence.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Temperature

If a heating element is attached to the window, then window defrosting is achieved, but the structure of the window may be damaged

Engineering Contradiction:

Improvewindow surface temperatureVSAvoidwindow structural integrity

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The patent carefully controls the temperature parameter of the heating element to maintain it within a safe range that prevents window damage. By regulating the heating element temperature to be sufficient for defrosting but below the threshold that could damage window materials, the system achieves effective defrosting while preserving window integrity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively keeps windows clear of frost and fog, maintaining visibility without disturbing game and reducing scent impact, using a portable and repositionable heating solution.

Implementation Method 1

Application of electricity to, and the resistance of the metal of the bar, causes the bar to heat

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

the heat from the bar to radiate thereby defogging and defrosting the window

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 3

The fasteners of this embodiment comprise a separate N52 magnet is press fit into each end of the heat sink

Methodology Applied

Scientific EffectMagnetism: Magnetism

Data Source

PatentUS20250254763A1Window defroster for small structures

Publication Date: 2025.08.07 HALE DAVID

AI summary

A window defroster system for a heated hunting blind or similar small structure in cold weather conditions. The system includes one or more repositionable heater assemblies powered by a portable power supply such as a battery, battery pack or generator, and including a backer bar for each heater assembly. The backer bars have magnets positioned so as to correspond to magnets in the heater assemblies, enabling the heater assemblies to be attached to the windows.