Inventor

Joshua Ward Christensen

Inventor

Savage, MN, US

Overview

2003–2020

Patent span

Physics

Primary field (CPC G)

Patents· 14 as inventor

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

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer82%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light12%

G06FElectric digital data processing6%

PatentTitleYear

10,777,224Servo zone transition optimization for disk drives2020 10,482,908Performance monitoring of a near-field transducer of a heat-assisted magnetic recording slider2019 10,438,620Servo zone transition optimization for magnetic disk recording devices2019 10,366,722Laser mode hop detection in a heat-assisted magnetic recording device using a slider sensor and laser modulation2019 10,147,454Heat-assisted magnetic recording device capable of detecting degradation of NFT by measuring back-heat from medium2018 10,083,716Laser calibration for heat-assisted magnetic recording head using interleaved laser current2018 9,966,100Setting laser current based on modulation level of an optical power sensor measurement2018 9,875,763Recovering user data from a variably encroached data track2018 9,761,258'Servo parameterization for multi-sensor reader'2017 9,741,386'Setting laser current based on modulation level of an optical power sensor measurement'2017 9,330,701'Dynamic track misregistration dependent error scans'2016 9,093,093'Adaptive guard band for multiple heads of a data storage device'2015 9,070,411'Writable servo overlap zones'2015 6,650,501'Higher inter-disc separations to improve disc drive actuator servo performance'2003

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2003–2020Patents assigned to SEAGATE TECHNOLOGY LLC (14)· patent assignee history

2003Based in Burnsville, MN, US· patent location history

2015–2020Based in Savage, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
SEAGATE TECHNOLOGY LLC	14	2003–2020

Locations

Location	Patents	Span
Savage, Minnesota, US	13	2015–2020
Burnsville, Minnesota, US	1	2003