Most Popular Links
Patents and Trademarks
Patents and Trademarks
Patents
Trademarks
Patent & Trademark Office Publications
Links to Intellectual Property Resources
General Information
Resources:
The California State Library is designated as one of 84 Patent and Trademark Depository Libraries (PTDLs). The depository has full patent specifications from 1932 to the present, and all reference publications of the U.S. Patent Classification System. Additional sources for conducting a preliminary patent search or researching historical patents include the Official Gazettes of Patents and Trademarks, and Annual Reports of the Patent Commissioner.
The backbone of PTDLs is CASSIS, (Classification and Search Support Information System) a quarterly CD-ROM product produced by the U.S. Patent and Trademark Office providing current information on U..S. Patents and Trademarks. Searchers can look for related technology by classification numbers, keywords, inventors or assigned companies. Trademark searches on CASSIS include all registered marks as well as pending marks since 1884.
All PTDL resources are available at no cost on a self-service basis. There is always professional staff available to answer general questions about using computerized databases, collections and other search tools. Users must come to the library to conduct searches. Staff cannot perform searches for individuals, and cannot give legal advice. More specialized questions should be directed to the USPTO. For legal advice, please contact a registered patent attorney or agent.
Location:
The Depository collection and services are available in the Information Resources and Government Publications reading room of the California State Library, in Room 301 of the Stanley Mosk Library and Courts Building. Located one block from the State Capitol building, the address is: 914 Capitol Mall, Sacramento.
Hours:
The library is open to all members of the general public Monday - Friday from 9:30 AM to 4:00 PM (excluding state holidays). Typical users include inventors, business people, educators, students and historians.
Copying:
PTDL materials are for reference use only and cannot be checked out.
Self-service photocopying and database printing are available for a small charge. Patent copies may be requested through the interlibrary loan process from your local library.
Contact:
Information Resources and Government Publications
916-654-0261