Source: https://onlinetrademarkattorneys.com/trademarks/us-trademark-renewal-service/
Timestamp: 2019-04-23 04:11:47+00:00

Document:
*USPTO filing fee of $125 for one international class is included. Any additional international classes will incur an additional fee of $224 per class ($99 legal fee and $125 USPTO fee).
*USPTO filing fee of $325 for one international class is included ($125 for § 8 and $200 for § 15). Any additional international classes will incur an additional fee of $424 per class ($99 legal fee and $325 USPTO fee).
**A § 15 Declaration is NOT mandatory to retain rights in your trademark. However, it does provide significant benefits.
§ 9 Renews Trademark for 10 yrs.
*USPTO filing fee of $425 for one international class is included ($125 for § 8 and $300 for § 9). Any additional international classes will incur an additional fee of $524 per class ($99 legal fee and $425 USPTO fee).
Our U.S. trademark renewal service ensures you renew your currently registered trademark to extend protection for five to ten years, based on the type of filing that’s due. Our trademark renewal flat fee service offers you professional service at a low flat fee price. Take a look below to find out which trademark renewal service is right for you.
We want to make the trademark renewal process as seamless as possible. That’s why we offer online trademark renewal options at low flat fees. Here, you can hire an attorney to submit your trademark renewal.
You need to file at least a section 8 declaration – stating you are still using your trademark between the 5th and 6th year of registration.
Incontestability Status Benefits (section 15): If filed, they can’t challenge your mark based on (1) it not being distinctive or lacks secondary meaning; (2) confusingly similar to a trademark that someone else used prior to the owner’s registration; and (3) simply functional (like the shape of a Coca-cola bottle is shaped like that because it’s easier to hold).
You need to file a section 8 and 9 renewal between the 9th and 10th year of registration.

References: § 8
 § 15
 § 15

§ 9
 § 8
 § 9