Answer:
Richard needs to use the symbol TM.
Step-by-step explanation:
There are some symbols that are specific for different use. TM symbol is used for trademarks that are not registered yet, trademarks that will be claim under the law terms. It can be used even when the trademark was denied but it does not mean that its use is restricted.
The other common symbols are the R for trademarks that are registered and its use without permission has legal consequences. The C symbol is used for copyright and protection.