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Patents and Trademarks

Patent & Trademark basic information, databases, links for legal and status information

Patent & TM Librarian

Jim Miller
Patent & Trademark Librarian
Engineering & Physical Sciences Library
University of Maryland
College Park MD 20742-7011
301-405-9152 [try email first]

Patent Expiration Date Calculator

This calculator provides a best estimate of the expiration date of a utility, plant, or design patent, based on a comprehensive list of factors than can be found in USPTO records.  Download Calculator 

Before relying on an expiration date, individuals should always carefully inspect all relevant documents available through the USPTO, court records and elsewhere, and consult with an attorney.

Helpful Sources

Patent and Trademark Resource Center Association "Handout Central"

Patents Guide by Mike White. Queens University, Ontario.

End-User Patent Searching Using Open Access Sources by Pat LaCourse. Engineering and Science Librarian. New York State College of Ceramics.

Patents Guide: "Help for Researchers". British Library

"Patents, Copyrights, & Trademarks"  , by National Paralegal College.  Extensive guide; made for a college audience but recommended to us by a teacher of advanced middle school students.

Patent & Trademark Resource Center

The Engineering & Physical Sciences Library is the College Park Patent & Trademark Resource Center

                   PTDLP logo

EPSL was designated Patent & Trademark Depository Library by USPTO in January 1984, and renamed a PTRC October 2011

Getting Started

The U.S. Government grants a patent to an inventor "to exclude others from making, using, offering for sale, or selling the invention throughout the United States or importing the invention into the United States."  A trademark is a word, phrase, symbol or design, or combination of words, phrases, symbols or designs, which identifies the source of goods or services of one party from those of another. A copyright protects works of authorship, such as writings, music, and works of art that have been tangibly expressed. See:

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