Application via Madrid Protocol 
The United States is a Contracting Party to the Madrid Protocol. The holder of an international registration may designate the United States for an extension of protection. A request for extension of protection to the United States is examined as a Section 66(a) application under U.S. trademark law.

 Registrable types of trademarks 
Words, names, symbols, designs, or any combination thereof, including color, three-dimensional marks, sound marks, and motion marks.

 Type of Mark 
Standard character mark, collective trademark, collective service mark, collective membership mark, certification mark

 Limitation on Numbers of Items 
There is no limitation on the number of designated goods or services. However, for applications under Sections 1 and 44, an additional fee is required for each class in which the free-form text box is used to identify goods and services. If the identification of goods and/or services in that class exceeds 1,000 characters, an additional fee is required for each additional group of 1,000 characters beyond the first 1,000 characters.

 Claim of Priority Based on a Foreign Application 

Priority may be claimed under Section 44(d) of the Trademark Act based on an earlier application for registration of the same mark filed in a qualifying foreign country, provided that the U.S. application is filed within 6 months from the date on which the foreign application was first filed.

 Exhibition Priority Claim 

U.S. trademark law does not provide a statutory priority claim based directly on the display of a trademark at an exhibition.

 Opposition Proceeding 
Any person who believes that he would be damaged by the registration of a mark may file an opposition within 30 days after the publication of the mark. Upon written request prior to the expiration of the 30-day period, the time for filing opposition shall be extended for an additional 30 days, and further extensions of time for filing opposition may be granted for good cause when requested prior to the expiration of an extension.

 Cancellation Proceeding 
Any person who believes that he, she or it is or will be damaged by the registration of a mark may file a petition to cancel the registration. A petition to cancel may be filed within 5 years from the date of the registration of the mark; for certain statutory grounds, a petition to cancel may be filed at any time

United States Patent and Trademark Office (USPTO) 

United States Trademark Search Database