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IPC Subclass
F15C

FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES

Introduced: September 1968

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
Subclass:
FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES

Description

Covers fluid-based logic and control systems employing hydraulic or pneumatic circuit elements designed to perform computational, control, or decision-making functions. This includes fluidic logic gates, fluid amplifiers, fluid oscillators, and integrated pneumatic/hydraulic control circuits that process signals or regulate system behavior without electronic components. Distinct from general fluid power transmission (F15B) and standard actuators (F15B, F15D), this class focuses on elements where fluid dynamics itself implements the control logic or signal processing function.

Related Keywords

fluid electric AMPLIFIERSfluid circuit elements for COMPUTING purposesfluid circuit elements for CONTROL(S) purposesFLUID(S) circuit elements for computing or control purposesHYDRAULIC(S) circuit elements for computing or control purposesfluid LOGIC circuitsPNEUMATIC(S) circuit elements for computing or control purposesfluid RELAY(S)

5 direct subcodes

Child Classifications

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  • F15C 4/00 Circuit elements characterised by their special functions
  • F15C 5/00 Manufacture of fluid-circuit elements; Manufacture of assemblages of such elements
  • F15C 7/00 Hybrid elements, i.e. circuit elements having features according to groups and

Top Applicants

Top 10 applicants by patent filingsfor class F15, 2013–2023, worldwide · Source: EPO PATSTAT

  1. ROBERT BOSCH DE 1,079
  2. SCHAEFFLER TECHNOLOGIES & COMPANY DE 980
  3. SMC CORPORATION JP 737
  4. HITACHI CONSTRUCTION MACHINERY COMPANY JP 674
  5. KYB CORPORATION JP 525
  6. CATERPILLAR US 461
  7. FESTO & COMPANY DE 451
  8. ZHEJIANG UNIVERSITY 448
  9. HITACHI CONSTRUCTION MACHINERY COMPANY 442
  10. XUZHOU HEAVY MACHINERY COMPANY 404