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Inventor

Darwin H. Isdahl

Inventor
Elk River, MN, US

Overview

2→
Patents
1989–1992
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 2 as inventor

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

E01Bprimary
E01BPermanent way50%
B24BMachines, devices, or processes for grinding or polishing25%
G05BControl or regulating systems in general25%
PatentTitleYear
5,140,776'Apparatus and method for measuring and maintaining the profile of a railroad track rail'19924,829,723'Rail grinding machine'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1992Patents assigned to LORAM MAINTENANCE OF WAY (2)· patent assignee history
1989Based in Plymouth, MN, US· patent location history
1992Based in Elk River, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
LORAM MAINTENANCE OF WAY21989–1992
Locations
LocationPatentsSpan
Elk River, Minnesota, US11992
Plymouth, Minnesota, US11989