LexDanaLexDanabeta
Inventor

Julian D. Keithahn

Inventor
Houston, TX, US

Overview

4→
Patents
1982–1987
Patent span
General tagging of new technological developments
Primary field (CPC Y)

Patents· 4 as inventor

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

Y10Tprimary
Y10TTechnical subjects covered by former us classification43%
E21BEarth or rock drilling29%
F16KValves29%
PatentTitleYear
4,635,678'Flow control apparatus'19874,605,195'Annular blowout preventer packing unit'19864,444,250'Flow diverter'19844,342,330'Ball type valve having improved redundant sealing system'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–1987Patents assigned to HYDRIL CO (4)· patent assignee history
1982–1987Based in Houston, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HYDRIL CO41982–1987
Locations
LocationPatentsSpan
Houston, Texas, US41982–1987