IBM Technical Disclosure Bulletins

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IBM Technical Disclosure Bulletins (TDB) were defensive publications produced by IBM between 1958 and January 1998. The TDBs provided IBM employees with a way to "publish defensive disclosures of inventions that were not formally patented," and TDBs are referenced over 48,000 times in US patent documents.[1]

The TDBs are available to search on, the search system Delphion, and they are kept on file at Patent & Trademark Offices and U.S. Government Depository Libraries.[2] User can also access copies of TDBs published prior to February 1998 from Denver Public Library and New York Public Library (for a fee).[2]


  1. "Non-patent Prior Art Collections." Delphion website, Accessed September 13, 2011.
  2. 2.0 2.1 "Technical disclosures for patents." IBM website, Accessed September 13, 2011.

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