Inventor

John H. Yonker

Inventor

Carrollton, TX, US

Overview

1976–1998

Patent span

Fixed constructions

Primary field (CPC E)

Patents· 21 as inventor

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

E21Bprimary

E21BEarth or rock drilling84%

Y10TTechnical subjects covered by former us classification8%

B05BSpraying apparatus4%

F16JPistons4%

PatentTitleYear

5,832,998'Coiled tubing deployed inflatable stimulation tool'1998 5,492,173'Plug or lock for use in oil field tubular members and an operating system therefor'1996 5,284,208'Production logging system using through flow line tools'1994 5,271,461'Coiled tubing deployed inflatable stimulation tool'1993 5,195,585'Wireline retrievable jet cleaning tool'1993 5,163,515'Pumpdown toolstring operations in horizontal or high-deviation oil or gas wells'1992 4,730,677'Method and system for maintenance and servicing of subsea wells'1988 4,530,485'Valve'1985 4,513,764'Valve'1985 4,494,608'Well injection system'1985 4,432,416'Well flow control apparatus'1984 4,428,557'Single line deep depth safety valve'1984 4,418,756'Method and apparatus for performing operations in well tubing'1983 4,294,315'Landing nipple'1981 4,273,186'Well safety valve system'1981 4,227,573'Reinforced seal unit for pumpdown pistons or well swabs'1980 4,103,740'Well tool with a pawl'1978 4,039,026'Kickover tool'1977 4,039,027'Circumferential centralizer'1977 4,026,363'Apparatus and method for performing a desired operation at a specified location in a well'1977 3,957,119'Pump down method'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1985Patents assigned to YONKER JOHN H (2)· patent assignee history

1976–1977Based in Dallas, TX, US· patent location history

1977–1993Patents assigned to OTIS ENG CO (14)· patent assignee history

1977–1998Based in Carrollton, TX, US· patent location history

1985Patents assigned to GRANHAUG OTTO J (1)· patent assignee history

1992Patents assigned to NORSKE STATS OLJESELSKAP (1)· patent assignee history

1993–1998Patents assigned to HALLIBURTON CO (4)· patent assignee history

1996Based in Carrolton, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
OTIS ENG CO	14	1977–1993
HALLIBURTON CO	4	1993–1998
YONKER JOHN Hself	2	1976–1985
GRANHAUG OTTO J	1	1985
NORSKE STATS OLJESELSKAP	1	1992

Locations

Location	Patents	Span
Carrollton, Texas, US	17	1977–1998
Dallas, Texas, US	3	1976–1977
Carrolton, Texas, US	1	1996