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http://www.google.com.au/patents/US2727730?utm_source=gb-gplus-share
Patent US2727730 - CRAKE
CRAKE
Wilfred S. Crake et al
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 2727730
Filing date
: 7 Jun 1954
Issue date
: 20 Dec 1955
Inventors
:
Wilfred S. Crake
,
Wilfred S. Crake
Current U.S. Classification
:
175/394
;
175/406
View patent at USPTO
Search USPTO Assignment Database
Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US4986375
4 Dec 1989
22 Jan 1991
Device for facilitating drill bit retrieval
US5390750
21 Jun 1993
21 Feb 1995
The Charles Machine Works, Inc.
Downhole compaction and stabilization back reamer and drill bit
Drawings
Drawings
