Phase-Change Thermal Cooker with Insulated Inner Pot

The problem

Cooking tough ingredients like meat and bones usually requires leaving a pot on a stove for hours, consuming fuel and demanding constant attention to prevent burning or boiling over. Conventional thermal flasks reduce heat loss but cannot actively supply heat back into the food once the temperature begins to drop. According to the patent, the objective is to provide an inner pot and outer cup system that maintains a high, steady temperature long enough to braise food effectively without continuous external heating.

The solution

1. The inner pot body is made from a heat-conductive material and includes a side wall and a bottom.
2. Phase-change material is sealed inside either the bottom or the side wall of this inner pot.
3. An insulating inner lid fits tightly onto the top of the inner pot body.
4. Two lifting ears are placed symmetrically at the top rim so the hot inner pot can be moved safely.
5. The inner pot sits inside an outer insulating cup, which has its own cavity sized to receive the pot.
6. An insulating outer lid covers the top of the outer cup, completing the double-insulation enclosure.

Who it is for

• Outdoor and camping gear brands looking for a fuel-saving cooking system where open fires or camp stoves are limited to short bursts.
• Housewares companies expanding their kitchenware lines with energy-efficient slow-cooking vessels for home kitchens.
• Promotional product suppliers sourcing practical, branded thermal cookers for corporate wellness or sustainability campaigns.
• Meal-prep container manufacturers adapting the separable PCM-core concept for bulk batch cooking and transport.

How it works

The main parts

Cooking steps

1. Charge the PCM - place the inner pot on a stove in boiling water for about five to ten minutes. The phase-change material absorbs heat and transitions to store energy.
2. Add food - put raw ingredients such as meat and bones into the inner pot, along with boiling water if not already added during charging.
3. Transfer - use the lifting ears to move the hot inner pot off the stove and lower it into the cavity of the outer insulating cup.
4. Seal - press the insulating inner lid onto the pot, then close the insulating outer lid over the cup.
5. Simmer - as the food cools toward 95 degrees Celsius, the phase-change material begins to revert to its solid state, releasing stored heat back through the conductive wall to maintain the simmering temperature.

Applications

Off-grid camping

Campers boil the inner pot on a small backpacking stove for a few minutes, then pack it away in the outer cup to let dinner cook while they hike. This eliminates the need to leave a flame unattended at a campsite and saves limited fuel canisters.

Home energy saving

Home cooks start a stew on the kitchen range, charge the PCM, and transfer the pot to the counter. The meal continues to braise for hours without drawing electricity or gas, reducing utility bills during long-simmer recipes.

Office lunches

Workers prepare oatmeal or soup in the morning by boiling the inner pot briefly. By lunchtime, the food remains hot enough to eat directly from the vessel, removing the need to wait in line for a shared office microwave.

Emergency preparedness

During power outages, users can heat the inner pot using any available emergency stove or fire. The phase-change material extends the useful heat far beyond what a standard thermos provides, allowing families to cook dried beans or rice without sustained fuel.

Where it is less suitable

• Frying or searing - the system is built for moist-heat braising and simmering, not dry high-temperature cooking methods.
• Rapid cooling needs - because the PCM is designed to hold heat near 95 degrees Celsius, it cannot be used to chill items unless a different phase-change temperature is selected during manufacturing.
• Ultra-lightweight backpacking - the added mass of the phase-change material and double-wall construction makes it heavier than single-wall titanium pots meant strictly for boiling water.