United States Trademark Registration Office Trademark Registration and Monitoring Divsion Highly deceptive direct mailing in the form off an invoice from an official government office Los Angeles, California
The invoice you receive makes you think its coming from the US Patent and Trademark office and that it is for a registration fee due to the official government office. However, if you look at the detailed test, you will find that is actually a solicitation and not a bill.
Trademarks being a sensitive issue, its a clever way to make you think you need to do something (officially) to protect your interests, however it is simply a trademark monitoring service that probably would provide a service you really dont need if your attorney has handled things properly for you.
Do not just send this over to your accounting office for payment. Read it. Its not a requirement for trademarks, just an additional service by an individual vendor.