Title:
Shrouded bit
United States Patent 3416618


Inventors:
Kunnemann, Elmer A.
Application Number:
US59043566A
Publication Date:
12/17/1968
Filing Date:
10/28/1966
Assignee:
Dresser, Ind
Primary Class:
Other Classes:
175/213, 175/215
International Classes:
E21B10/04; E21B21/12
View Patent Images:
US Patent References:
3273660N/A1966-09-20
3151690Well drilling apparatus1964-10-06
2786652Bottom hole pressure control in well drilling1957-03-26
2657016Fluid circulation head for drill strings1953-10-27
2261546Shrouded drill bit1941-11-04
1996322Rock drilling core bit1935-04-02
1961362Rock core drill head1934-06-05