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Inventor

Henry H. Leggett

Inventor
San Francisco, CA, US

Overview

16→
Patents
1987–2019
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 16 as inventor

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

E21Bprimary
E21BEarth or rock drilling53%
LOC0721%
Y10TTechnical subjects covered by former us classification11%
C10BDestructive distillation of carbonaceous materials for production of gas, coke, tar, or similar materials5%
F16KValves5%
Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution5%
PatentTitleYear
10,513,660Compact fast pyrolysis system for conversion of carbonaceous materials to liquid, solid and gas201910,030,482Valve mechanism having tool trap2018D0808229'Knife block'2018D0808230'Knife block'2018D0804916'Knife block'2017D0804257'Knife block'20176,394,460'One-piece ram element block for wireline blowout preventers'20026,145,807'By-pass stud with integral safety valve'20005,662,312'Pressurized sheave mechanism for high pressure wireline service'19975,287,879'Hydraulically energized wireline blowout preventer'19944,938,290'Wireline blowout preventer having mechanical and hydraulic sealing'19904,886,115'Wireline safety mechanism for wireline tools'19894,883,119'Mechanical latching device operated by dead weight and tension'19894,846,272'Downhole shuttle valve for wells'19894,828,023'Mechanical latching device operated by dead weight and tension'19894,687,055'Wire-line controlled down-hole shut-in tool for wells'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1994Patents assigned to EASTERN OIL TOOLS PTE LTD (5)· patent assignee history
1989Patents assigned to EASTERN OIL TOLLS PTE LTD (1)· patent assignee history
1989Based in Singapore, SG· patent location history
1994–2002Based in Hallsville, TX, US· patent location history
2000Patents assigned to HYDROLEX INC (1)· patent assignee history
2017–2018Patents assigned to LEGGETT HENRY (4)· patent assignee history
2017–2018Based in San Francisco, CA, US· patent location history
2018Based in Livingston, TX, US· patent location history
2019Patents assigned to ABRI TECH INC (1)· patent assignee history
2019Based in Namur, CA· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
EASTERN OIL TOOLS PTE LTD51989–1994
LEGGETT HENRYself42017–2018
ABRI TECH INC12019
EASTERN OIL TOLLS PTE LTD11989
HYDROLEX INC12000
Locations
LocationPatentsSpan
San Francisco, California, US42017–2018
Hallsville, Texas, US41994–2002
Singapore, SG31989
Namur, CA12019
Livingston, Texas, US12018