Controlling water feed or water level; Automatic water feeding or water-level regulators

Filing statistics

CPC F22D 5/00 belongs to the parent subclass F22D, which recorded 5,699 patent applications worldwide between 2013 and 2023. Annual filings grew from 227 in 2013 to 702 in 2023 (+209%), peaking at 774 applications in 2020. The most active applicants in class F22 are XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (544 applications), SIEMENS (306 applications) and PHILIP MORRIS PRODUCTS (258 applications).

Source: EPO PATSTAT, worldwide filings

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Child Classifications

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F22D 5/02 with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level
F22D 5/04 with pivoting buckets
F22D 5/06 with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level
F22D 5/08 with float-actuated valves
F22D 5/14 responsive to thermal expansion and contraction, e.g. of solid elements
F22D 5/18 for varying the speed or delivery pressure of feed pumps
F22D 5/24 with electric switches
F22D 5/26 Automatic feed-control systems

Top Applicants

Top 10 applicants by patent filingsfor class F22, 2013–2023, worldwide · Source: EPO PATSTAT

XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 544
SIEMENS DE 306
PHILIP MORRIS PRODUCTS CH 258
GENERAL ELECTRIC TECHNOLOGY CH 254
MITSUBISHI HITACHI POWER SYSTEMS JP 235
XIAN JIAOTONG UNIVERSITY 214
MITSUBISHI HEAVY INDUSTRIES JP 195
MITSUBISHI HITACHI POWER SYSTEMS 169
HARBIN BOILER COMPANY 166
VALMET TECHNOLOGIES FI 155