INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

Description

F05D is an indexing classification for cross-referencing technical aspects applicable to non-positive-displacement machines, gas turbines, and jet-propulsion systems that are detailed in other subclasses within F01–F04. This classification facilitates navigation of innovations involving continuous-flow engines, turbomachinery, and aerospace propulsion by mapping common design features, control methods, and operational characteristics across the broader engine classification scheme. It does not itself describe specific technologies but rather serves as a navigational tool to locate related subject matter distributed throughout the fundamental engine and pump classes.

Filing statistics

CPC subclass F05D recorded 129,755 patent applications worldwide between 2013 and 2023. Annual filings declined from 11,710 in 2013 to 7,840 in 2023 (-33%), peaking at 14,062 applications in 2016. The most active applicants in class F05 are GE (GENERAL ELECTRIC COMPANY) (12,002 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (8,736 applications) and SAFRAN AIRCRAFT ENGINES (6,804 applications).

Source: EPO PATSTAT, worldwide filings