Celebration of the American patent system : a complete summary of the proceedings in observance of the one hundred twenty-fifth anniversary of the United States Patent act of 1836, Washington, D.C., October 18-25 inc., 1961.
Patent laws and legislation -- United States.
United States. Patent Office.
United States. Department of Commerce.
Patent Office Society (U.S.)
International Patent Office Workshop on Information Retrieval (1961 : Washington, D.C.)