Inventor
HOWLETT PAUL DAVID
GB16 patents
⚠️ This page may combine multiple inventors who share the name “HOWLETT PAUL DAVID”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SPECIALISED PETROLEUM SERV LTD
12 patentsUS6102060AAug 15, 2000
Detachable locking device for a control valve and method
SPECIALISED PETROLEUM SERV LTD70 citations96
US7413023B2Aug 19, 2008
Wellhead seal unit
SPECIALISED PETROLEUM SERV LTD25 citations92
US7322408B2Jan 29, 2008
Downhole tool with actuable barrier
SPECIALISED PETROLEUM SERV LTD51 citations92
US7096950B2Aug 29, 2006
Combined milling and scraping tool
SPECIALISED PETROLEUM SERV LTD41 citations92
US6896064B2May 24, 2005
Compression set packer and method of use
SPECIALISED PETROLEUM SERV LTD28 citations92
US7191835B2Mar 20, 2007
Disengagable burr mill
SPECIALISED PETROLEUM SERV LTD10 citations84
US7055605B2Jun 6, 2006
Downhole circulation valve operated by dropping balls
SPECIALISED PETROLEUM SERV LTD17 citations84
US7757771B2Jul 20, 2010
Wellhead seal unit
SPECIALISED PETROLEUM SERV LTD5 citations73
US7237617B2Jul 3, 2007
Disengageable downhole tool
SPECIALISED PETROLEUM SERV LTD9 citations73
US7740073B2Jun 22, 2010
Wellhead seal unit
SPECIALISED PETROLEUM SERV LTD3 citations62
US7228910B2Jun 12, 2007
Safety mechanism for weight-set downhole tool
SPECIALISED PETROLEUM SERV LTD4 citations62
US7152686B2Dec 26, 2006
Downhole weight bearing apparatus and method
SPECIALISED PETROLEUM SERV LTD0 citations52