* Operator (Asterisk) can be used as a placeholder for any unknown or wildcard terms. This is a great operator when you are not sure of a certain part of the query or there can be multiple variations of that part. e.g. * signal sent by base station, now it will capture the results disclosing all type of signals sent by base station like Pilot, Control, etc.
Nikhil Gupta
Manager, Patent Search Team – GreyB