Membership
Tour
Register
Log in
Bernhardt F. Giebeler
Follow
Person
San Bernardino, CA, US
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Ball valve device with hold-open tube
Patent number
4,565,213
Issue date
Jan 21, 1986
Bernhardt & Frederick Co., Inc.
Bernhardt F. Giebeler
E21 - EARTH DRILLING MINING
Information
Patent Grant
Pressure balanced ball valve device
Patent number
4,377,179
Issue date
Mar 22, 1983
Bernhardt & Frederick Co., Inc.
Bernhardt F. Giebeler
E21 - EARTH DRILLING MINING
Information
Patent Grant
Kelly valve
Patent number
4,262,693
Issue date
Apr 21, 1981
Bernhardt & Frederick Co., Inc.
Bernhardt F. Giebeler
E21 - EARTH DRILLING MINING
Information
Patent Grant
Stroke actuated well testing tool
Patent number
4,050,512
Issue date
Sep 27, 1977
BJ-Hughes Inc.
Bernhardt F. Giebeler
E21 - EARTH DRILLING MINING