Inventor

ZWALD JR EDWIN A

US3 patents

⚠️ This page may combine multiple inventors who share the name “ZWALD JR EDWIN A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ENVENTURE GLOBAL TECHNOLOGY

2 patents

US7100685B2Sep 5, 2006

Mono-diameter wellbore casing

ENVENTURE GLOBAL TECHNOLOGY48 citations95

US7823659B2Nov 2, 2010

Apparatus and methods for drilling and lining a wellbore

ENVENTURE GLOBAL TECHNOLOGY7 citations64

SHELL OIL CO

1 patent

US7325602B2Feb 5, 2008

Method and apparatus for forming a mono-diameter wellbore casing

SHELL OIL CO16 citations83