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Inventor

Randy Johnston

Inventor
Burnsville, MN, US

Overview

5→
Patents
1994–2014
Patent span
Performing operations
Primary field (CPC B)

Patents· 5 as inventor

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

B41Jprimary
B41JTypewriters33%
E21BEarth or rock drilling22%
F16CShafts22%
F16JPistons11%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%
PatentTitleYear
8,857,933'Ink supply reservoir'20147,866,810'Ink jet printer'2011RE036452'Composite seal for rotary cone rock bits'19995,825,394'Thermal print head calibration and operation method for fixed imaging elements'19985,362,073'Composite seal for rotary cone rock bits'1994

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1994–1999Patents assigned to SMITH INTERNATIONAL (2)· patent assignee history
1994Based in Conroe, TX, US· patent location history
1998–2014Based in Burnsville, MN, US· patent location history
1999Based in Spring, TX, US· patent location history
2011–2014Patents assigned to HEWLETT PACKARD DEVELOPMENT CO (2)· patent assignee history
2011Based in Lakeville, MN, US· patent location history
2014Patents assigned to BARCLAY AARON (1)· patent assignee history
2014Patents assigned to BEERY CHAD (1)· patent assignee history
2014Patents assigned to CAMPION KEVIN (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HEWLETT PACKARD DEVELOPMENT CO22011–2014
SMITH INTERNATIONAL21994–1999
BARCLAY AARON12014
BEERY CHAD12014
CAMPION KEVIN12014
Locations
LocationPatentsSpan
Burnsville, Minnesota, US21998–2014
Lakeville, Minnesota, US12011
Spring, Texas, US11999
Conroe, Texas, US11994