Inventor

Lars I. Sjoholm

Inventor

Burnsville, MN, US

Overview

1984–2017

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 20 as inventor

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

F25Bprimary

F25BRefrigeration machines, plants or systems35%

F04CRotary-piston, or oscillating-piston, positive-displacement machines for liquids19%

F01PCooling of machines or engines in general11%

B60HArrangements of heating, cooling, ventilating or other air-treating devices specially adapted for passenger or goods spaces of vehicles8%

F25DRefrigerators5%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests5%

Y10TTechnical subjects covered by former us classification5%

B01DSeparation3%

F01CRotary-piston or oscillating-piston machines or engines3%

F16CShafts3%

PatentTitleYear

9,612,042'Method of operating a refrigeration system in a null cycle'2017 9,062,903'Economizer combined with a heat of compression system'2015 8,082,747'Temperature control through pulse width modulation'2011 6,718,781'Refrigeration unit apparatus and method'2004 6,506,038'Wear-preventing and positioning device for a screw compressor'2003 6,494,699'Axial unloading lift valve for a compressor and method of making the same'2002 6,467,287'Valve arrangement for a compressor'2002 5,598,718'Refrigeration system and method utilizing combined economizer and engine coolant heat exchanger'1997 5,477,695'Methods and apparatus for operating a refrigeration system characterized by controlling engine coolant'1995 5,465,586'Methods and apparatus for operating a refrigeration system characterized by controlling engine coolant'1995 5,465,587'Methods and apparatus for operating a refrigeration system characterized by controlling engine coolant'1995 5,410,889'Methods and apparatus for operating a refrigeration system'1995 5,408,836'Methods and apparatus for operating a refrigeration system characterized by controlling engine coolant'1995 5,400,609'Methods and apparatus for operating a refrigeration system characterized by controlling maximum operating pressure'1995 5,246,357'Screw compressor with oil-gas separation means'1993 5,228,301'Methods and apparatus for operating a refrigeration system'1993 4,850,197'Method and apparatus for operating a refrigeration system'1989 4,773,229'Method for refrigeration systems'1988 4,758,136'Screw compressor lubrication channel for lubrication of a rotor bearing'1988 D0276355'Toy excavator'1984

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1984Based in Varnamo, SE· patent location history

1988Patents assigned to SVENSKA ROTOR MASKINER AB (2)· patent assignee history

1988–1989Based in Sollentuna, SE· patent location history

1989–2017Patents assigned to THERMO KING CORP (14)· patent assignee history

1993–1997Patents assigned to WESTINGHOUSE ELECTRIC CORP (2)· patent assignee history

1993–2017Based in Burnsville, MN, US· patent location history

2011–2015Patents assigned to SJOHOLM LARS I (2)· patent assignee history

2015Patents assigned to FREUND PETER W (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
THERMO KING CORP	14	1989–2017
SJOHOLM LARS Iself	2	2011–2015
SVENSKA ROTOR MASKINER AB	2	1988
WESTINGHOUSE ELECTRIC CORP	2	1993–1997
FREUND PETER W	1	2015

Locations

Location	Patents	Span
Burnsville, Minnesota, US	16	1993–2017
Sollentuna, SE	3	1988–1989
Varnamo, SE	1	1984