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IPC Main Group
H02J 15/00

Systems for storing electric energy specially adapted for power networks

Introduced: July 1974

Last revised: January 2026

Classification Context

Section:
ELECTRICITY
Class:
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
Subclass:
ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

5 direct subcodes

Child Classifications

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  • H02J 15/1 using storage of hydraulic energy
  • H02J 15/2 using storage of pneumatic energy, e.g. compressed air energy storage [CAES]
  • H02J 15/3 using storage of inertial or mechanical energy, e.g. using flywheels
  • H02J 15/4 using coils, e.g. superconductive magnetic energy storage [SMES] systems
  • H02J 15/5 using stored hydrogen

Top Applicants

Top 10 applicants by patent filingsfor class H02, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SGCC(STATE GRID CORPORATION OF CHINA) 54,496
  2. MITSUBISHI ELECTRIC CORPORATION JP 10,495
  3. TOYOTA MOTOR CORPORATION 9,464
  4. GUANGDONG POWER GRID CORPORATION 9,339
  5. ROBERT BOSCH DE 8,226
  6. SIEMENS DE 8,218
  7. DENSO CORPORATION 7,063
  8. MITSUBISHI ELECTRIC CORPORATION 6,619
  9. SAMSUNG ELECTRONICS COMPANY KR 5,826
  10. GREE ELECTRIC APPLIANCES 5,094