Letter Codes for US Patents & Published Patent Applications
Commencing on January 1, 2002, letter Codes were added to United States Patents.
In 2002, the United States Patent and Trademark Office (USPTO) began publishing Patent Applications that included letter Codes.
Some of the Letter Codes Used by the USPTO
Letter Code Document Type
A Utility Patent Grant issued prior to January 2, 2001
A1 Utility Patent Application published on or after January 2, 2001
A2 Second or subsequent publication of a Utility Patent Application
A9 Correction published Utility Patent Application
Bn Reexamination Certificate issued prior to January 2, 2001
B1 Utility Patent Grant without pre-grant publication issued on or after January 2, 2001
B2 Utility Patent Grant with pre-grant publication issued on or after January 2, 2001
Cn Reexamination Certificate issued on or after January 2, 2001
E Reissue Patent
S Design Patent
If your company needs assistance with its intellectual properties, contact Business Patent Law, PLLC.
Ask Us Anything… about Intellectual Property!
If you or your business are located in the greater Cincinnati, Indianapolis, Lexington, or Louisville standard metropolitan statistical areas and have a topic or question you would like Business Patent Law, PLLC to address in the blog, please contact us.
Business Patent Law, PLLC provides intellectual property and business counsel for businesses and companies. If you need assistance, please contact Business Patent Law, PLLC.
If you would like to stay up-to-date with news that impacts your business and intellectual property, sign up for Business Patent Law’s Monthly Mailer™ newsletter.