Inventor · disambiguated record
William A. Blizzard, Jr.
Also filed as: BLIZZARD JR WILLIAM A · BLIZZARD JR WILLIAM ALLEN · BLIZZARD WILLIAM · BLIZZARD WILLIAM A
27 granted patents·1,942 citations·filing 1984–2000
98Inventor score
Technology areasE21B
Top patents by PatentIndex Score
27 records- 0197US4588030AWell tool having a metal seal and bi-directional lockCAMCO INC·Filed 1984·Granted May 13, 1986·204 cites·22 claims
- 0296US5887655AWellbore milling and drillingWEATHERFORD LAMB·Filed 1997·Granted Mar 30, 1999·279 cites·31 claims
- 0392US5727629AWellbore milling guide and methodWEATHERFORD LAMB·Filed 1996·Granted Mar 17, 1998·136 cites·20 claims
- 0490US5826651AWellbore single trip millingWEATHERFORD LAMB·Filed 1996·Granted Oct 27, 1998·156 cites·9 claims
- 0587US5464062AMetal-to-metal sealable portWEATHERFORD US INC·Filed 1994·Granted Nov 7, 1995·88 cites·4 claims
- 0687US4660646AFailsafe gas closed safety valveCAMCO INC·Filed 1985·Granted Apr 28, 1987·80 cites·12 claims
- 0785US4588029AExpandable metal seal for a well toolCAMCO INC·Filed 1984·Granted May 13, 1986·63 cites·16 claims
- 0884US4585067AMethod and apparatus for stopping well productionCAMCO INC·Filed 1984·Granted Apr 29, 1986·64 cites·13 claims
- 0982US6209636B1Wellbore primary barrier and related systemsWEATHERFORD LAMB·Filed 1999·Granted Apr 3, 2001·102 cites·54 claims
- 1079US6202752B1Wellbore milling methodsWEATHERFORD LAMB·Filed 1999·Granted Mar 20, 2001·91 cites·15 claims
- 1179US6116336AWellbore mill systemWEATHERFORD LAMB·Filed 1997·Granted Sep 12, 2000·71 cites·24 claims
- 1277US6092601AApparatus for completing a subterranean well and associated methods of using sameHALLIBURTON ENERGY SERV INC·Filed 1998·Granted Jul 25, 2000·80 cites·23 claims
- 1375US6116344AApparatus for completing a subterranean well and associated methods of using sameHALLIBURTON ENERGY SERV INC·Filed 1998·Granted Sep 12, 2000·72 cites·14 claims
- 1475US4838355ADual hydraulic safety valveCAMCO INC·Filed 1988·Granted Jun 13, 1989·46 cites·16 claims
- 1569US6076602AApparatus for completing a subterranean well and associated methods of using sameHALLIBURTON ENERGY SERV INC·Filed 1998·Granted Jun 20, 2000·57 cites·10 claims
- 1669US5368098AStage toolWEATHERFORD US INC·Filed 1993·Granted Nov 29, 1994·38 cites·17 claims
- 1767US6334487B1Valve assemblyFiled 2000·Granted Jan 1, 2002·29 cites·32 claims
- 1865US5803176ASidetracking operationsWEATHERFORD LAMB·Filed 1996·Granted Sep 8, 1998·48 cites·3 claims
- 1961US6070665AWellbore millingWEATHERFORD LAMB·Filed 1998·Granted Jun 6, 2000·42 cites·18 claims
- 2060US6547006B1Wellbore liner systemWEATHERFORD LAMB·Filed 2000·Granted Apr 15, 2003·19 cites·33 claims
- 2159US5743331AWellbore milling systemWEATHERFORD LAMB·Filed 1996·Granted Apr 28, 1998·31 cites·13 claims
- 2257US6059037AApparatus for completing a subterranean well and associated methods of using sameHALLIBURTON ENERGY SERV INC·Filed 1998·Granted May 9, 2000·39 cites·25 claims
- 2355US6155349AFlexible wellbore millWEATHERFORD LAMB·Filed 1998·Granted Dec 5, 2000·30 cites·27 claims
- 2455US6024168AWellborne mills & methodsWEATHERFORD LAMB·Filed 1997·Granted Feb 15, 2000·35 cites·39 claims
- 2546US5029646AOrifice well safety valve with release mechanismCAMCO INT·Filed 1990·Granted Jul 9, 1991·19 cites·5 claims
- 2643US4860991ASafety valveCAMCO INC·Filed 1989·Granted Aug 29, 1989·13 cites·12 claims
- 2733US6056056AWhipstock millFiled 1998·Granted May 2, 2000·10 cites·19 claims
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