Inventor

Neil H. Akkerman

Inventor

Houston, TX, US

Overview

1977–2021

Patent span

Fixed constructions

Primary field (CPC E)

Patents· 80 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

E21Bprimary

E21BEarth or rock drilling42%

Y10TTechnical subjects covered by former us classification15%

F16KValves12%

F15BSystems acting by means of fluids in general5%

A61MDevices for introducing media into, or onto, the body5%

F16HGearing2%

H01FMagnets2%

H02JElectric power networks2%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests2%

B23BTurning2%

PatentTitleYear

11,085,278Top-down fracturing system2021 11,072,985Unlocking and unblocking tool for disconnect assembly for cylindrical members2021 11,065,437Cardiac support systems and methods for chronic use2021 10,975,661Top-down fracturing systems and methods2021 10,731,445Top-down fracturing system2020 10,568,998High efficiency blood pump2020 10,449,277Cardiac support systems and methods for chronic use2019 9,512,683'Disconnect assembly for cylindrical members'2016 9,415,147'High efficiency blood pump'2016 9,227,001'High efficiency blood pump'2016 8,551,163'Cardiac support systems and methods for chronic use'2013 8,393,241'Sequential gear shifting mechanism'2013 7,353,697'System for mounting an engine to a frame'2008 5,513,703'Methods and apparatus for perforating and treating production zones and otherwise performing related activities within a well'1996 5,465,786'Subsurface tubing safety valve'1995 5,413,173'Well apparatus including a tool for use in shifting a sleeve within a well conduit'1995 5,411,096'Surface controlled, subsurface tubing safety valve'1995 5,358,053'Subsurface safety valve'1994 5,295,907'Rorque limiting device'1994 5,263,847'Subsurface tubing safety valve'1993 5,195,721'Fail safe valve actuator'1993 5,193,615'Apparatus for use in controlling flow through a tubing string suspended and packed off within well bore as well as within the annulus between the tubing string and well bore above and below the packer'1993 5,176,220'Subsurface tubing safety valve'1993 5,095,978'Hydraulically operated permanent type well packer assembly'1992 5,027,129'Gimballed antenna'1991 4,926,188'Gimballed antenna'1990 4,852,648'Well installation in which electrical current is supplied for a source at the wellhead to an electrically responsive device located a substantial distance below the wellhead'1989 4,783,046'Pneumatic valve actuators'1988 4,776,397'Tool for lowering into centered position within a well bore'1988 4,768,594'Valves'1988 4,745,971'Multiple string well packer'1988 4,726,421'Latching devices'1988 4,691,893'Fail safe gate valves and actuators therefor'1987 4,641,707'Well apparatus'1987 4,640,350'Kickover tool'1987 4,632,406'Apparatus in which an annular ring is carried within a groove about one member for slidably engaging the cylindrical surface of another member'1986 4,628,998'Well apparatus'1986 4,605,064'Well apparatus'1986 4,591,197'Wire line running and/or pulling tool'1986 4,582,135'Well packers'1986 4,542,792'Method and removable auxiliary apparatus for permanently locking open a well flow control device'1985 4,540,047'Flow controlling apparatus'1985 4,522,259'Well apparatus'1985 4,519,575'Valves and valve actuators'1985 4,505,332'Well packers'1985 4,505,331'Side pocket mandrel'1985 4,488,596'Locking apparatus for use in a subterranean well'1984 4,488,595'Well tool having a slip assembly'1984 4,477,104'Releasable latching apparatus'1984 4,475,599'Valve for subterranean wells'1984 4,470,340'Locking mechanism for fluid operated actuator'1984 4,467,866'Flow controlling apparatus'1984 4,460,048'Pump through equalizing check valve for use in intermittent gas lift well'1984 4,440,223'Well slip assemblies'1984 4,434,847'Flow controlling apparatus'1984 4,421,174'Cyclic annulus pressure controlled oil well flow valve and method'1983 4,407,363'Subsurface well apparatus'1983 4,396,066'Method and apparatus for effecting sealed connection to upstanding irregular end of tubing positioned in a well'1983 4,393,929'Well packers and slip assemblies for use therewith'1983 4,374,487'Pilot with cantilevered spring'1983 4,349,175'Valve actuator having a continuously charged accumulator'1982 4,345,651'Apparatus and method for the mechanical sequential release of cementing plugs'1982 4,325,402'Bimodal, non-venting pneumatic relay'1982 4,325,431'Flow controlling apparatus'1982 4,297,087'Apparatus for pumping fluid from a well through a tubing string'1981 4,297,088'Pump assembly comprising gas spring means'1981 4,279,272'Flow line monitor pilot valve assembly'1981 4,263,839'Heat sensitive locking device'1981 4,248,138'Fail safe locking mechanism for fluid operated valve actuator'1981 4,225,110'Actuator for converting linear to rotary motion'1980 4,202,368'Safety valve or blowout preventer for use in a fluid transmission conduit'1980 4,187,870'Valve actuator and pilot assembly therefor'1980 4,188,011'Spool valve and pilot interface assembly'1980 4,182,369'Spool valve and pilot interface assembly'1980 4,160,463'Flow line monitor pilot valve assembly'1979 4,157,167'Valve actuator and pilot assembly therefor'1979 4,135,547'Quick disengaging valve actuator'1979 4,130,166'Valve and lubricator apparatus'1978 4,103,744'Safety valve and ball type equalizing valve'1978 4,062,406'Valve and lubricator apparatus'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1984Patents assigned to BAKER INT CORP (14)· patent assignee history

1977–1982Based in New Orleans, LA, US· patent location history

1979–1984Patents assigned to BAKER CAC (11)· patent assignee history

1980–1986Based in Kingwood, TX, US· patent location history

1982–1996Patents assigned to AVA INT CORP (29)· patent assignee history

1984–2021Patents assigned to AKKERMAN NEIL H (8)· patent assignee history

1984–2021Based in Houston, TX, US· patent location history

2013–2021Patents assigned to EVERHEART SYSTEMS INC (6)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
AVA INT CORP	29	1982–1996
BAKER INT CORP	14	1977–1984
BAKER CAC	11	1979–1984
AKKERMAN NEIL Hself	8	1984–2021
EVERHEART SYSTEMS INC	6	2013–2021

Locations

Location	Patents	Span
Houston, Texas, US	45	1984–2021
Kingwood, Texas, US	23	1980–1986
New Orleans, LA, US	12	1977–1982