Patent Assignment
Reel/Frame 071499/0428
Security Interest
Recorded: 2025-06-06
Pages: 17
Assignor
MAINSPRING ENERGY, INC.
Executed: 2025-06-06
Assignee
AVENUE VENTURE OPPORTUNITIES FUND II, L.P., AS AGENT
11 WEST 42ND STREET, 9TH FLOOR, NEW YORK, NEW YORK, 10036
Covered Properties
(89)
Anti-Friction Sealing Rings
Application:
18/293,267 →
Publication:
US 2025/0092951
Piston Sealing Ring Assembly Having a Gap Cover Element
Piston Sealing Ring Assemblies
Application:
18/786,327 →
Publication:
US 2025/0060035
Integrated Linear Generator System
High-Power Core System
Application:
18/593,424 →
Publication:
US 2024/0297553
High-Efficiency Linear Generator
Energy Storage and Conversion in Linear Generators
Application:
18/518,321 →
Publication:
US 2024/0240586
Linear Electromagnetic Machine with a Stator Having Stator Teeth Arranged to Provide an Anti-Clocking Force.
Linear Generator System Having a Polygonal Layout
Application:
19/067,605 →
Publication:
US 2025/0279696
Integrated Linear Generator System
Application:
19/030,716 →
Publication:
US 2025/0167632
Sealing Ring Assemblies Configured for Pressure Locking
Application:
18/968,950 →
Publication:
US 2025/0250970
Core Synchronization for Linear Generators
Systems and Methods for Flexure-Based Bearing Mounting
Application:
19/058,787 →
Publication:
US 2025/0260288
Ring Change Tooling and Methods
Application:
18/854,504 →
Auto-Braking for an Electromagnetic Machine
Systems and Methods for Flexure-Based Bearing Mounting
Control of Piston Trajectory in a Linear Generator
Sealing Ring Assemblies Configured for Pressure Locking
Core Synchronization for Linear Generators
Piston Sealing Ring Assembly Having a Gap Cover Element
Piston Sealing Ring Assemblies
Integrated Linear Generator System
High-Efficiency Linear Generator
Manifold Interface Seal
Open-Faced Piston Assembly
Springs for Piston Ring Biasing
Energy Storage and Conversion in Linear Generators
Piston Sealing Ring Assembly Having a Gap Cover Element
Integrated Linear Generator System
Reinforced Sealing Rings
Control of Piston Trajectory in a Linear Generator
Auto-Braking for an Electromagnetic Machine
Piston Seal with Solid Lubricant Applicator
Linear Electromagnetic Machine System
Energy Storage and Conversion in Linear Generators
Sealing Ring Assemblies Configured for Pressure Locking
High-Efficiency Linear Generator
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Patent:
49,259 →
Application:
16/912,538 →
Integrated Linear Generator System
Energy Storage and Conversion in Linear Generators
Piston Sealing Ring Assemblies
Control of Piston Trajectory in a Linear Generator
Open-Faced Piston Assembly
Piston-Integrated Gap Cover
Auto-Braking for an Electromagnetic Machine
Reinforced Sealing Rings
Control of Piston Trajectory in a Linear Generator
Dc-Dc Converter in a Non-Steady System
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Managing a Clearance Gap in a Piston Engine
Methods and Systems for Controlling a Multiphase Electromagnetic Machine
Patent:
8,344,669 →
Application:
13/437,659 →
Methods and Systems for Controlling a Multiphase Electromagnetic Machine
High-Efficiency Linear Combustion Engine
High-Efficiency Linear Combustion Engine
High-Efficiency Linear Combustion Engine
High-Efficiency Linear Combustion Engine
High-Efficiency Linear Combustion Engine
High-Efficiency Linear Combustion Engine
Linear Free Piston Combustion Engine with Indirect Work Extraction via Gas Linkage
Mechanism for Maintaining a Clearance Gap
Energy Storage and Conversion in Free-Piston Combustion Engines
Energy Storage and Conversion in Free-Piston Combustion Engines
Energy Storage and Conversion in Free-Piston Combustion Engines
Control of Piston Trajectory in a Free-Piston Combustion Engine
Patent:
9,657,675 →
Application:
15/087,990 →
Control of Piston Trajectory in a Free-Piston Combustion Engine
Control of Piston Trajectory in a Free-Piston Combustion Engine
Control of Piston Trajectory in a Free-Piston Combustion Engine
Open-Faced Piston Assembly
Patent:
9,856,821 →
Application:
15/294,438 →
Open-Faced Piston Assembly
Open-Faced Piston Assembly
Reinforced Sealing Rings
Piston-Integrated Gap Cover
Piston Sealing Ring Assembly Having a Gap Cover Element
Piston Sealing Ring Assemblies
Piston Seal with Solid Lubricant Applicator
Auto-Braking for an Electromagnetic Machine
Auto-Braking for an Electromagnetic Machine
Dc-Dc Converter in a Non-Steady System
Sealing Ring Assemblies Configured for Pressure Locking
High-Power Core System
PCT:
PCT/US2024/018207 ↗
Systems and Methods for Providing Ammonia Fuel to Linear Generators
PCT:
PCT/US2024/031315 ↗
Anti-Friction Sealing Rings
PCT:
PCT/US2022/038709 ↗
A Linear Generator System with a Battery
PCT:
PCT/US2024/036250 ↗
Related Assignments
(25)
Other recorded transfers of the patents in this record — the chain of ownership.
Assignment of Assignor's Interest
Aug 24, 2022
From: LAWLER, JOHN; WATTERS, NEIL; SHERMAN, SAMUEL; SVRCEK, MATTHEW
To: MAINSPRING ENERGY, INC.
Reel/Frame 060883/0722 →
Assignment of Assignor's Interest
Nov 16, 2022
From: SVRCEK, MATT; PRUDHOMME, JODIE
To: ETAGEN, INC.
Reel/Frame 061790/0492 →
Assignment of Assignor's Interest
Nov 16, 2022
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 061950/0323 →
Change of Name
Feb 22, 2023
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 062822/0743 →
Assignment of Assignor's Interest
Feb 22, 2023
From: LAWLER, JOHN; POWERS, JOHN; COAKLEY, SCOTT; CRAPO, ALAN
To: ETAGEN, INC.
Reel/Frame 062766/0435 →
Change of Name
Apr 10, 2023
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 063281/0929 →
Assignment of Assignor's Interest
Apr 10, 2023
From: DA COSTA, ANTHONY; ROELLE, MATTHEW; POWERS, JOHN; GORZELIC, PATRICK
To: ETAGEN, INC.
Reel/Frame 063275/0298 →
Assignment of Assignor's Interest
May 12, 2023
From: SCHAEFERLE, NICK; WONG, YUK HEI; GORZELIC, PATRICK; ROELLE, MATTHEW
To: MAINSPRING ENERGY, INC.
Reel/Frame 063629/0231 →
Change of Name
Aug 8, 2023
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 064523/0524 →
Assignment of Assignor's Interest
Aug 8, 2023
From: PRUDHOMME, JODIE; SVRCEK, MATT
To: ETAGEN, INC.
Reel/Frame 064520/0814 →
Change of Name
Aug 8, 2023
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 064521/0202 →
Assignment of Assignor's Interest
Aug 8, 2023
From: ROELLE, MATTHEW; GADDA, CHRISTOPHER
To: ETAGEN, INC.
Reel/Frame 064523/0414 →
Assignment of Assignor's Interest
Apr 9, 2024
From: GADDA, CHRISTOPHER; ROELLE, MATTHEW; SIMPSON, ADAM
To: ETAGEN, INC.
Reel/Frame 067044/0981 →
Change of Name
Apr 9, 2024
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 067045/0966 →
Assignment of Assignor's Interest
May 1, 2024
From: SIMPSON, ADAM; MILLER, SHANNON; SVRCEK, MATT
To: ETAGEN, INC.
Reel/Frame 067283/0877 →
Change of Name
May 1, 2024
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 067288/0673 →
Assignment of Assignor's Interest
May 28, 2024
From: SVRCEK, MATT; DEGRAAFF, DAVID; WALTERS, KEVIN; WYLIE, CAMERON
To: MAINSPRING ENERGY, INC.
Reel/Frame 067536/0699 →
Change of Name
Jan 9, 2025
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 069867/0972 →
Assignment of Assignor's Interest
Jan 9, 2025
From: SVRCEK, MATT; PRUDHOMME, JODIE
To: ETAGEN, INC.
Reel/Frame 069805/0637 →
Assignment of Assignor's Interest
Jan 9, 2025
From: SCHAEFERLE, NICK; WONG, YUK HEI; GORZELIC, PATRICK; ROELLE, MATTHEW
To: MAINSPRING ENERGY, INC.
Reel/Frame 069799/0085 →
Assignment of Assignor's Interest
Mar 6, 2025
From: LAWLER, JOHN; WATTERS, NEIL; SHERMAN, SAMUEL; SVRCEK, MATTHEW
To: MAINSPRING ENERGY, INC.
Reel/Frame 070421/0385 →
Assignment of Assignor's Interest
Mar 7, 2025
From: SVRCEK, MATTHEW
To: MAINSPRING ENERGY, INC.
Reel/Frame 070437/0758 →
Change of Name
Mar 25, 2025
From: ETAGEN, INC.
To: MAINSPRING ENERGY, INC.
Reel/Frame 070629/0139 →
Assignment of Assignor's Interest
Mar 25, 2025
From: SVRCEK, MATT; PRUDHOMME, JODIE
To: ETAGEN, INC.
Reel/Frame 070626/0530 →
Assignment of Assignor's Interest
Apr 3, 2025
From: PRUDHOMME, JODIE; SVRCEK, MATT
To: ETAGEN, INC.
Reel/Frame 070722/0310 →