LexDanaLexDanabeta
Inventor

John F. Steinke

Inventor
Fountain Valley, CA, US

Overview

3→
Patents
1976–2021
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 3 as inventor

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

E21Bprimary
E21BEarth or rock drilling50%
F16DCouplings for transmitting rotation25%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems25%
PatentTitleYear
10,971,994Artificial stable short circuit failure mode function by using parallel modules for each switching function20214,102,411'Drill stem for drilling upwardly'19783,987,856'Kelly crowd for vertical drill rig'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1978Patents assigned to SMITH INTERNATIONAL (2)· patent assignee history
1976–1978Based in Fountain Valley, CA, US· patent location history
2021Patents assigned to ABB SCHWEIZ AG (1)· patent assignee history
2021Based in Albbruck, DE· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
SMITH INTERNATIONAL21976–1978
ABB SCHWEIZ AG12021
Locations
LocationPatentsSpan
Fountain Valley, California, US21976–1978
Albbruck, DE12021