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PCE
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IPC Main Group
C02F 5/00

Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents

Introduced: January 1980

Last revised: January 2023

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Subclass:
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

Related Keywords

preventing INCRUSTATION by adding agents to waterPREVENTING scale or incrustation by adding agents to waterSCALE(S) preventionadding scale preventives or sequestration agents to WATER

2 direct subcodes

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class C02, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 3,734
  2. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,761
  3. MIDEA 1,938
  4. TONGJI UNIVERSITY 1,433
  5. HARBIN INSTITUTE OF TECHNOLOGY 1,380
  6. HOHAI UNIVERSITY 1,367
  7. BEIJING UNIVERSITY OF TECHNOLOGY 1,317
  8. CHANGZHOU UNIVERSITY 1,248
  9. ZHEJIANG UNIVERSITY 1,229
  10. SOUTH CHINA UNIVERSITY OF TECHNOLOGY 1,203