Houston, Texas
United States
16
2016-03-31
The entities that hold a legal rights for patent applications filed by inventor Campbell John E.:
John E. Campbell from Houston, US has applied for patents for these inventions. The list has both pending applications and granted patents:
Balancing load on milling cutting elements
#2 | 2015-05-21RETRIEVAL TOOL AND METHODS OF USE
#3 | 2013-08-22Cementing whipstock apparatus and methods
#4 | 2013-08-08Extended whipstock and mill assembly
#5 | 2013-07-11Pressure activated flow switch for a downhole tool
#6 | 2012-09-13Expandable window milling bit and methods of milling a window in casing
#7 | 2011-10-20Cementing whipstock apparatus and methods
#8 | 2008-10-09Drilling and hole enlargement device
#9 | 2007-07-19Drilling and hole enlargement device
#10 | 2007-06-07Thru tubing tool and method
#11 | 2007-02-20Thru tubing tool and method
#12 | 2007-01-11Expandable window milling bit and methods of milling a window in casing
#13 | 2005-09-08Expandable anchor
#14 | 2005-08-30Well reference apparatus and method
#15 | 2005-05-31Casing attachment method and apparatus
#16 | 2005-03-10Liner running system and method
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