The Steffen Patents were at issue in federal lawsuits in Minnesota, Indiana and Iowa.

Entity and relation annotations:
id: 0
type: entity
value: text: Minnesota
labels: <Location>
id: 1
type: entity
value: text: Indiana
labels: <Location>
id: 2
type: entity
value: text: Iowa
labels: <Location>
id: 3
type: entity
value: text: The Steffen Patents
labels: <Regulation>