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Inventor

Hifumi Ota

Inventor
Handa, JP

Overview

2→
Patents
2002–2021
Patent span
Chemistry
Primary field (CPC C)

Patents· 2 as inventor

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

C21Dprimary
C21DModifying the physical structure of ferrous metals33%
C22CAlloys33%
H04MTelephonic communication33%
PatentTitleYear
10,920,297High-strength seamless steel pipe for oil country tubular goods and method of producing the same20216,339,642'Telephone apparatus with howling prevention function'2002

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2002Patents assigned to CANON KK (1)· patent assignee history
2002Based in Fussa, JP· patent location history
2021Patents assigned to JFE STEEL CORP (1)· patent assignee history
2021Based in Handa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CANON KK12002
JFE STEEL CORP12021
Locations
LocationPatentsSpan
Handa, JP12021
Fussa, JP12002