Patent searching by keywords typically means searching for keywords in the abstract and/or full-text of the patent.
A robust set of keywords should be brainstormed before you search. As you search, this list should be reviewed and updates as new search results surface new keywords.
To start off, think about:
Also, think about where truncation and search operators (AND / OR / NOT) may be useful.
Keyword searching has many limitations, such as :
Using patent classification codes in combination with keywords is recommended by most patent search experts.
The Cooperative Patent Classification (CPC) system is the most comprehensive and precise classification system and has been jointly developed and adopted by the USPTO and EPO. It links to the International Patent Classification (IPC) system of codes, which is used by all national patent administrative bodies.