The California State Railroad Museum Patent Collection contains original and photocopies of patents documenting an invention. The patents are primarily for railroad related subjects and are generally dated from 1863-1941.

A patent for an invention is the grant of a property right to the inventor, issued by the United States Patent and Trademark Office. Generally, the term of a new patent is 20 years from the date on which the application for the patent was filed in the United States or, in special cases, from the date an earlier related application was filed, subject to the payment of maintenance fees. U.S. patent grants are effective only within the United States, U.S. territories, and U.S. possessions. Under certain circumstances, patent term extensions or adjustments may be available.

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Copyright has not been assigned to the California State Railroad Museum. All requests for permission to publish or quote from manuscripts must be submitted in writing to the Librarian. Permission for publication is given on behalf of the CSRM as the owner of the physical items and is not intended to include or imply permission of the copyright holder, which must also be obtained by the reader.

Collection is open for research by appointment.