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Inventor

Saburo Ishijima

Inventor
Yokohama, JP

Overview

3→
Patents
1979–1984
Patent span
Mechanical engineering
Primary field (CPC F)

Patents· 3 as inventor

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

B23Kprimary
B23KSoldering or unsoldering20%
C21DModifying the physical structure of ferrous metals20%
F16KValves20%
F27BFurnaces, kilns, ovens or retorts in general20%
Y10TTechnical subjects covered by former us classification20%
PatentTitleYear
4,457,488'Sluice valve arrangement'19844,417,722'Vacuum furnace for heat treatment'19834,157,779'Process for producing a metal vacuum bottle'1979

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1979–1984Patents assigned to NIPPON OXYGEN CO LTD (3)· patent assignee history
1979–1983Based in Yokohama, JP· patent location history
1984Based in Kanagawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
NIPPON OXYGEN CO LTD31979–1984
Locations
LocationPatentsSpan
Yokohama, JP21979–1983
Kanagawa, JP11984