United States Patent: 3145964 ( 1

Issue Date:

Patent Grant 3145964

U.S. patent number [Application Number ] was granted by the patent office on 1964-08-25 for united states patent: 3145964 ( 1.


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United States Patent 3,145,964
Issue Date: August 25, 1964
Current U.S. Class: 254/93R; 91/168
Current CPC Class: E21D 15/44 (20130101)
Current International Class: E21D 15/44 (20060101); E21D 15/00 (20060101)


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