The CPC areas currently undergoing maintenance (MP) or revision (RP) are listed in the table below together with the corresponding project number. Once finalized, the outcome of these projects will be summarized in a Notice of Change to be published one to two months before the corresponding changes are implemented in the CPC Scheme.
| Project | Status | CPC | Title |
| MP0514 | Active | A01C | [IPC2022.01][M238] Remove NLR from and introduce DEFS into CPC |
| RP0258 | Active | A01K73/00,75/00,77/00,83/00,85/00,87/00 | Angling |
| MP0503 | Active | A01N | [C-SETS] A01N C-Set project |
| MP0532 | Active | A23C | [IPC2022.01][M234] Removal of non-limiting references in subclass A23C |
| MP0537 | Active | A23L | [IPC2022.01][M809] Remaining issues and the removal of non-limiting references in subclass A23L |
| RP0737 | Active | A43B | [IPC2022.01][F139] Characteristic features of footwear; Parts of footwear |
| RP0738 | Active | A47J37/10,37/12 | [IPC2022.01][M806] Review of the title of groups A47J 37/10 and 37/12 |
| RP0740 | Active | A61B1/00004-1/0655 | Diagnosis; surgery; identification |
| RP0751 | Active | A61B5/04 | Follow up to RP0697 * expedited for August release |
| RP0759 | Active | A61F11/00 | [IPC2022.01][F137] Methods or devices for treatment of the ears |
| RP0681 | Active | A61K40/00 | Cellular immunotherapy /CART |
| RP0526 | Active | A61M1/14-A61M1/387 | Suction or pumping devices for medical purposes, devices for carrying off, for treatment of, or for carrying-over, body-liquids |
| RP0729 | Active | A63B | Removal 'not used' and another three IPC subgroups are not present in the CPC scheme |
| RP0736 | Active | B01D46/00 | [IPC2022.01][F136] Filters or filtering processes specially modified for separating dispersed particles from gases or vapours |
| RP0764 | Active | B01D50/00 | [IPC2022.01][F147] Combinations of devices for separating particles from gases or vapours |
| RP0445 | Active | B01D61/00 | Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor |
| RP0757 | Active | B01F | [IPC2022.01][F089] Mixing, e.g. dissolving, emulsifying or dispersing |
| RP0754 | Active | B09B3/00 | [IPC2022.01][C504] Destroying solid waste or transforming solid waste into something useful or harmless |
| RP0730 | Active | B22F1/00 | [IPC2022.01][C492] Metallic powders; Special treatment of metallic powder |
| RP0363 | Active | B23B51/00 | Tools for drilling machines |
| RP0552 | Active | B23C5/00,2210/00 | Milling |
| RP0727 | Active | B23D45,49,53,55,59,61,63,65;B27B17/14;B27G | revision related to Saws |
| RP0669 | Active | B29C,B29B | Blow-moulding |
| RP0562 | Active | B60Q | Vehicle Lighting and Signalling |
| RP0731 | Active | B60R1/00 | [IPC2022.01][C500] Optical viewing arrangements |
| RP0761 | Active | B61L27/00 | [IPC2022.01][F144] Central traffic control systems |
| RP0728 | Active | B64D,B64G,B61B,B61H | Scheme and definition corrections in B61 and B64 |
| RP0722 | Active | B65H | Handling of thin and filamentary materials |
| RP0734 | Active | C01F7/00 | [IPC2022.01][F133] Compounds of Aluminium |
| MP0525 | Active | C10G | CRACKING HYDROCARBON OILS |
| MP0526 | Active | C11D | DETERGENT COMPOSITIONS |
| MP0508 | Active | C12N | [C-SETS] MICROORGANISMS OR ENZYMES |
| RP0715 | Active | C12N2700/00 | Deletion of duplicated groups with same scheme title and indent corrections |
| RP0735 | Active | C12P7/62,C12P7/64 | [IPC2022.01][F135] Preparation of carboxylic acid esters; Preparation of fats; fatty oils; ester-type waxes; higher fatty acids |
| MP0509 | Active | C12Q | MEASURING OR TESTING PROCESSES INVOLVING ENZYMES |
| RP0720 | Active | C23C2/00 | Hot-dipping or immersion processes |
| RP0750 | Active | C25B | Follow up to RP0690 * expedited for August release |
| MP0533 | Active | D01H | [IPC2022.01][M233] Removal of non-limiting references in subclass D01H |
| MP0512 | Active | D03D15/00 | [IPC2022.01][C498] Remove NLR from and introduce DEFS into CPC |
| RP0719 | Active | F02B | INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL |
| MP0522 | Active | F02D | [IPC2022.01][M236] Removal of non-limiting references in subclass F02D |
| MP0523 | Active | F02K | [IPC2022.01][M231] Removal of non-limiting references in subclass F02K |
| RP0765 | Active | F24D | [IPC2022.01][F150] Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply |
| MP0531 | Active | F24F,F24F3/16,7/00 | Def from RP0696 |
| RP0758 | Active | F24H | [IPC2022.01][F107] Controlling of fluid heaters; Details of fluid heaters |
| MP0513 | Active | F25B41/00 | [IPC2022.01][C499] Remove NLRs for F25B and C499 DEFS into CPC |
| MP0535 | Active | G01B9/02 | [IPC2022.01][C507] Interferometers |
| RP0713 | Active | G01C19/00,G01P9/00 | Gyroscopes |
| RP0755 | Active | G01F | [IPC2022.01][C506] Measuring volume, volume flow, mass flow or liquid level; metering by volume |
| RP0752 | Active | G01J5/00 | [IPC2022.01][C502] Radiation pyrometry |
| MP0519 | Active | G02B | [IPC2022.01][M799] Removal of NLR |
| MP0520 | Active | G02B,G02F | [IPC2022.01][M807] Review of titles and definitions in subclasses G02B and G02F |
| RP0742 | Active | G04B | MECHANICALLY-DRIVEN CLOCKS OR WATCHES |
| MP0505 | Active | G06F1/00-G06F1/3296 | Removal of non-limiting references and inconsistencies in Definitions |
| MP0506 | Active | G06F3/00-G06F3/167 | Removal of non-limiting references and inconsistencies in Definitions |
| RP0763 | Active | G06F3/048 | [IPC2022.01][F146] Interaction techniques based on graphical user interfaces [GUI] |
| RP0760 | Active | G06K9/00(NEW:G06V) | [IPC2022.01][F143] Image or video recognition or understanding |
| RP0762 | Active | G06N10/00 | [IPC2022.01][F145] Quantum computing |
| MP0504 | Active | G08B | Removal of non-limiting references |
| MP0529 | Active | H01J | Electric discharge tubes or discharge lamps |
| RP0743 | Active | H01L21/20 | SEMICONDUCTOR DEVICES |
| MP0527 | Active | H01L24/00 | SEMICONDUCTOR DEVICES |
| MP0516 | Active | H01M | [IPC2022.01][M628] Proposals for improving the IPC - Electricity, Physics |
| RP0733 | Active | H02K1/27 | [IPC2022.01][F119] Rotor cores with permanent magnets |
| MP0511 | Active | H03B,C,D,K | H03B,C,D,K Relocation of NLR in scheme and modifications to definitions |
| MP0530 | Active | H04L | Data switching networks |
| RP0732 | Active | H04L12/24,12/26,12/58,12/70 | [IPC2022.01][F071] Data switching network, e.g. packet switching networks |
| RP0675 | Active | H04M | Telephone substation equipment |
| RP0716 | Active | H04M2001/0204,1/021-1/738 | Deletion of superfluous H04M 2001/0204 - Substation equipment |
| RP0717 | Active | H04N1/00,2201/00 | Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device |
| MP0521 | Active | H04W | [IPC2022.01][M628] Proposals for improving the IPC - Electricity, Physics |
| RP0753 | Active | H05B,H05B45/00 | [IPC2022.01][C503] Circuit arrangements for operating LED comprising organic material |
| RP0723 | Active | H05B47 | Circuit arrangements for operating light sources in general |
| RP0724 | Active | H05K5,7 | Electronic casings |
| RP0748 | Active | Y10T477 | Y10T 477 deletion with no transfer |
| MP0536 | Active | various | [IPC2022.01][M805] Review of the use of 'deux ou plus' and 'plusieurs' in the French version of the IPC |
| MP0534 | Active | various | [IPC2022.01][M621] Proposals for improving the IPC - Technology independent |
| RP0725 | Active | various | Alignment residual groups IPC-CPC |
| MP0528 | Active | various | [Master Quick-Fix] |
| MP0518 | Active | various | [IPC2022.01][M791] French term 'Manipulation' |
| MP0517 | Active | various | [IPC2022.01][M631] Correction of obvious errors |
| MP0515 | Active | various | [IPC2022.01][M627] Proposals for improving the IPC - Chemistry |