Inventor

John A. Imsdahl

Inventor

Richfield, MN, US

Overview

5→

Patents

1988–2002

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 5 as inventor

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

F17Cprimary

F17CVessels for containing or storing compressed, liquefied or solidified gases22%

F28DHeat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do not come into direct contact22%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests22%

B65DContainers for storage or transport of articles or materials, e.g. bags, barrels, bottles, boxes, cans, cartons, crates, drums, jars, tanks, hoppers, forwarding containers11%

F02CGas-turbine plants11%

H05KPrinted circuits11%

PatentTitleYear

6,338,471'Flow control system for an evaporative cooler sump'2002 6,206,348'Evaporative cooler for a gas turbine engine'2001 5,003,431'Insertion, extraction, and clamping apparatus for electrical modules'1991 4,796,432'Long hold time cryogens dewar'1989 4,750,631'Anti-slosh apparatus for liquid containers'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988Patents assigned to SPERRY CORP (1)· patent assignee history

1988–1991Based in Richfield, MN, US· patent location history

1989–1991Patents assigned to UNISYS CORP (2)· patent assignee history

2001–2002Patents assigned to DONALDSON CO INC (2)· patent assignee history

2001–2002Based in Bloomington, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
DONALDSON CO INC	2	2001–2002
UNISYS CORP	2	1989–1991
SPERRY CORP	1	1988

Locations

Location	Patents	Span
Richfield, Minnesota, US	3	1988–1991
Bloomington, Minnesota, US	2	2001–2002