Patent assignee · US · COMPANY

EtaGen, Inc.

31Patents
31Active
31Granted
54Portfolio score

Filing activity: Nov 23, 2010 → Jan 15, 2019

Most-cited patents

PatentTitleAreaCited byStatus
US8413617B2 High-efficiency two-piston linear combustion engine Mechanical Engineering; Lighting; Heating 24 Active
US9657675B1 Control of piston trajectory in a free-piston combustion engine Mechanical Engineering; Lighting; Heating 17 Active
US8402931B2 High-efficiency linear combustion engine Emerging Cross-Sectional Technologies 15 Active
US9856821B1 Open-faced piston assembly Mechanical Engineering; Lighting; Heating 13 Active
US8662029B2 High-efficiency linear combustion engine Emerging Cross-Sectional Technologies 7 Active
US10436322B2 Piston sealing ring assemblies Mechanical Engineering; Lighting; Heating 7 Active
US8344669B1 Methods and systems for controlling a multiphase electromagnetic machine Electricity 7 Active
US10443727B2 Sealing ring assemblies configured for pressure locking Mechanical Engineering; Lighting; Heating 6 Active
US10408150B2 Control of piston trajectory in a free-piston combustion engine Mechanical Engineering; Lighting; Heating 5 Active
US9719415B2 Energy storage and conversion in free-piston combustion engines Electricity 4 Active
US10359002B2 Open-faced piston assembly Mechanical Engineering; Lighting; Heating 3 Active
US9567898B2 High-efficiency linear combustion engine Emerging Cross-Sectional Technologies 3 Active
US8997699B2 Linear free piston combustion engine with indirect work extraction via gas linkage Mechanical Engineering; Lighting; Heating 3 Active
US10156198B2 Control of piston trajectory in a free-piston combustion engine Mechanical Engineering; Lighting; Heating 2 Active
US10404199B2 Auto-braking for an electromagnetic machine Electricity 2 Active
US8720317B2 Methods and systems for managing a clearance gap in a piston engine Mechanical Engineering; Lighting; Heating 1 Active
US8624542B2 Methods and systems for controlling a multiphase electromagnetic machine Electricity 1 Active
US8656895B2 Methods and systems for managing a clearance gap in a piston engine Mechanical Engineering; Lighting; Heating 1 Active
US8453612B2 High-efficiency linear combustion engine Mechanical Engineering; Lighting; Heating 1 Active
US9004038B2 Methods and systems for managing a clearance gap in a piston engine Mechanical Engineering; Lighting; Heating 0 Active
US10190490B2 Energy storage and conversion in free-piston combustion engines Electricity 0 Active
US10006401B2 Methods and systems for managing a clearance gap in a piston engine Mechanical Engineering; Lighting; Heating 0 Active
US10554099B2 DC-DC converter in a non-steady system Mechanical Engineering; Lighting; Heating 0 Active
US10215229B2 Mechanism for maintaining a clearance gap Mechanical Engineering; Lighting; Heating 0 Active
US10221759B2 High-efficiency linear combustion engine Emerging Cross-Sectional Technologies 0 Active

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.