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Inventor

Mark C. Ehlert

Inventor
Duncan, OK, US

Overview

4→
Patents
1986–1991
Patent span
Physics
Primary field (CPC G)

Patents· 4 as inventor

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

G01Nprimary
G01NInvestigating or analysing materials by determining their chemical or physical properties38%
G05DSystems for controlling or regulating non-electric variables25%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry13%
F16KValves13%
Y10TTechnical subjects covered by former us classification13%
PatentTitleYear
4,990,076'Pressure control apparatus and method'19914,917,349'Valve, and set point pressure controller utilizing the same'19904,829,811'Fluid testing apparatus and method'19894,622,846'Consistency and static gel strength measuring device and method'1986

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1986–1991Patents assigned to HALLIBURTON CO (4)· patent assignee history
1986–1991Based in Duncan, OK, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HALLIBURTON CO41986–1991
Locations
LocationPatentsSpan
Duncan, OK, US41986–1991