Mainspring Energy, INC.
At a glance
Employees500+
In business sinceNot reported
HeadquartersMenlo Park, CA
US patents44
SAM.gov UEIXEU1P6B256V6
CAGE code9WRM0
Incorporated inDE
Supplier designations
For Profit OrganizationManufacturer of Goods
Self-certified by the company in its SAM.gov registration
Patents
44 US patents granted 2020–2025, 39 of them in the five years to SEP 2025.
Mechanical elements 18Engines, pumps, turbines 16Electrical machinery, apparatus, energy 9
- High-efficiency linear generatorUS 12,421,890 · granted SEP 23, 2025
- Auto-braking for an electromagnetic machineUS 12,283,911 · granted APR 22, 2025
- Systems and methods for flexure-based bearing mountingUS 12,255,514 · granted MAR 18, 2025
- Control of piston trajectory in a linear generatorUS 12,209,548 · granted JAN 28, 2025
- Sealing ring assemblies configured for pressure lockingUS 12,188,457 · granted JAN 7, 2025
Newest 5 shown · Granted to Mainspring Energy, Inc. · PatentsView (USPTO), data through SEP 30, 2025 · CC BY 4.0
Their plant
| Facility | City | State | Employees | Status |
|---|---|---|---|---|
| Mainspring Energy Headquarters | Menlo Park | CA | 500+ | ACTIVE |
Compiled from federal records — EPA, OSHA, SAM.gov and the U.S. Census — and from the company’s own website. Federal source data is public domain. Each plant’s page names the source of every field.