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Title:
Junk shot
United States Patent 3016830
Inventors:
Kirby II, John Henry
Application Number:
US79709359A
Publication Date:
01/16/1962
Filing Date:
03/04/1959
Assignee:
Kirby II, John Henry
Primary Class:
Other Classes:
102/313, 102/319, 166/99, 175/4.56, 175/67
International Classes:
E21B29/02; E21B31/00
View Patent Images:
US Patent References:
2876843Gun perforator1959-03-10
2869825Earth boring1959-01-20
2760408Firing head1956-08-28
2293259Device for preventing clogging of drilling bits1942-08-18
2058287Bore hole device and method of its use1936-10-20