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Inventor

John T. Harvell

Inventor
Sudbury, MA, US

Overview

6→
Patents
1981–2007
Patent span
Mechanical engineering
Primary field (CPC F)

Patents· 6 as inventor

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

F04Bprimary
F04BPositive-displacement machines for liquids31%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests31%
F04DNon-positive-displacement pumps19%
B01DSeparation6%
F25BRefrigeration machines, plants or systems6%
F25DRefrigerators6%
PatentTitleYear
7,155,919'Cryopump temperature control of arrays'20075,157,928'Electronically controlled cryopump'19925,156,007'Cryopump with improved second stage passageway'19924,918,930'Electronically controlled cryopump'19904,860,546'Vacuum system with molecular flow line'19894,259,844'Stacked disc heat exchanger for refrigerator cold finger'1981

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1981–1992Patents assigned to HELIX TECH CORP (5)· patent assignee history
1981Based in Lexington, MA, US· patent location history
1989Based in Subduby, MA, US· patent location history
1990–2007Based in Sudbury, MA, US· patent location history
2007Patents assigned to BROOKS AUTOMATION INC (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HELIX TECH CORP51981–1992
BROOKS AUTOMATION INC12007
Locations
LocationPatentsSpan
Sudbury, Massachusetts, US41990–2007
Subduby, Massachusetts, US11989
Lexington, Massachusetts, US11981