INVESTORS
Developing the Next Stage of HHES
HHES is advancing the patented MDE platform across multiple scales and heat-source configurations, supported by active engineering and a long development record.
CURRENT ENGINEERING
A Practical Path to Hardware Validation
HHES is evaluating multiple MDE configurations and scales to determine the most practical path to physical prototype validation.
MDE designs undergo analytical and computational evaluation before physical prototype fabrication, followed by instrumented hardware testing.
Prototype configuration and sequencing will be selected based on engineering results, fabrication practicality, and development priorities.
DEVELOPMENT PLATFORM
One Architecture. Multiple Scales.
The broader program spans smaller mobile/RV-scale development, larger residential/small-business development, and educational 5–10 cc development. Analytical and computational work is underway; measured hardware results remain to be established.
VALIDATION
What Prototype Testing Must Answer
Prototype testing is intended to replace design assumptions with measured data and establish the basis for assessing practical performance.
- Actual mechanical and electrical output, thermal efficiency, and heat-transfer performance.
- Pressure and mechanical losses, cooling requirements, and the operating envelope.
- Noise and vibration, seal and bearing behavior, and durability.
- Manufacturing cost and assembly complexity, supported by manufacturing analysis.
DEVELOPMENT EVIDENCE
A Long Development Record
The record begins with the earliest surviving geometry sketch in 2008 and a Partial Proof of Concept in 2010. March 2024 brought the common-space and midpoint thermal communication milestone, with further architecture maturation in 2024.
The U.S. nonprovisional application was filed March 25, 2025, and the U.S. patent issued June 9, 2026. The historical model evidence does not establish current platform performance.
View Patent & DevelopmentPATENT PORTFOLIO
Intellectual Property
U.S. Patent
Issued U.S. patent: U.S. Patent No. 12,650,097 B1
Maximum Delivery Adiabatic Hot-Air Engine
Filed March 25, 2025 · Issued June 9, 2026
Published International Application
Published PCT international application: PCT/US2026/020310
Published as WO 2026/206813 A1
International filing date: March 23, 2026
Published October 1, 2026
MARKET POSITION
Why the Opportunity Matters
Proposed systems include Combined Heat and Power (CHP) using solar plus combusted-fuel heat, CHP using combusted-fuel heat alone, and power-focused combusted-fuel generation. All three would use the same fundamental external-combustion architecture.
Explore proposed energy systemsCompatibility with third-party batteries and inverters could support variable demand. Integration and heat recovery also require validation.
The external-combustion MDE architecture will offer a substantially quieter operating profile than conventional small internal-combustion generators.
DEVELOPMENT STATUS
Pre-Commercial Development
HHES remains in engineering and pre-commercial development.
Prototype and full-size performance, durability, production cost, certification requirements, and commercial economics remain to be established through testing and manufacturing analysis.
COLLABORATION
Engage with HHES
HHES welcomes interest from strategic investors, manufacturing partners, engineering collaborators, and prototype-development partners.
Contact information