United States Patent: 3489460 ( 1

Issue Date:

Patent Grant 3489460

U.S. patent number [Application Number ] was granted by the patent office on 1970-01-13 for united states patent: 3489460 ( 1.


Full text is not available for this patent. Click on "Images" button above to view full patent.

United States Patent 3,489,460
Issue Date: January 13, 1970
Current U.S. Class: 299/1.7; 251/65; 405/300
Current CPC Class: E21D 23/14 (20130101); E21C 35/14 (20130101)
Current International Class: E21D 23/00 (20060101); E21C 35/00 (20060101); E21C 35/14 (20060101); E21D 23/14 (20060101)


* * * * *


© 2021 USPTO.report | Privacy Policy | Resources | RSS Feed of Trademarks | Trademark Filings Twitter Feed