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Inventor

David A. Hill

Inventor
Kirksville, MO, US

Overview

8→
Patents
1978–2021
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 8 as inventor

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

E21Bprimary
E21BEarth or rock drilling36%
B63BShips or other waterborne vessels7%
B65DContainers for storage or transport of articles or materials, e.g. bags, barrels, bottles, boxes, cans, cartons, crates, drums, jars, tanks, hoppers, forwarding containers7%
B66CCranes7%
F04BPositive-displacement machines for liquids7%
F04CRotary-piston, or oscillating-piston, positive-displacement machines for liquids7%
F15BSystems acting by means of fluids in general7%
G09BEducational or demonstration appliances7%
H02BBoards, substations or switching arrangements for the supply or distribution of electric power7%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%
PatentTitleYear
11,059,547System arranged on a marine vessel or platform, such as for providing heave compensation and hoisting20217,617,876'Formation isolation valve and method of use'20097,347,272'Formation isolation valve'20086,729,391'Insertable progressing cavity pump'20046,105,670'Injection/isolation tool'20006,085,837'Downhole fluid disposal tool and method'20004,293,072'Stackable equipment containers'19814,112,593'Apparatus for the use in the construction of electric circuits'1978

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1978Patents assigned to HILL DAVID ARTHUR (1)· patent assignee history
1978Patents assigned to LOMNITZER ABRAHAM (1)· patent assignee history
1978–1981Based in Johannesburg, ZA· patent location history
2000–2004Patents assigned to KUDU IND INC (3)· patent assignee history
2000Based in Bragg Creek, CA· patent location history
2004Based in Calgary, CA· patent location history
2008–2009Patents assigned to SCHLUMBERGER TECHNOLOGY CORP (2)· patent assignee history
2008–2009Based in Kirksville, MO, US· patent location history
2021Patents assigned to NAT OILWELL VARCO NORWAY AS (1)· patent assignee history
2021Based in Kristiansand, NO· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
KUDU IND INC32000–2004
SCHLUMBERGER TECHNOLOGY CORP22008–2009
HILL DAVID ARTHURself11978
LOMNITZER ABRAHAM11978
NAT OILWELL VARCO NORWAY AS12021
Locations
LocationPatentsSpan
Kirksville, MO, US22008–2009
Bragg Creek, CA22000
Johannesburg, ZA21978–1981
Kristiansand, NO12021
Calgary, CA12004