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Inventor

Keith N. Krier

Inventor
Tonka Bay, MN, US

Overview

6→
Patents
1976–1983
Patent span
Human necessities
Primary field (CPC A)

Patents· 6 as inventor

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

A47Lprimary
A47LDomestic washing or cleaning40%
E01HStreet cleaning30%
A46BBrushes10%
B60LPropulsion of electrically-propelled vehicles10%
Y02TClimate change mitigation technologies related to transportation10%
PatentTitleYear
4,378,855'Multi-speed drive with forward/reverse lockout'19834,334,335'Scrubber with hydraulic squeegee lift'19824,262,382'Multi-speed brush control'19814,138,756'Surface maintenance machine drive and brush'19793,942,218'Scrubbing machine'19763,938,212'Scrubbing machine'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1983Patents assigned to TENNANT CO (6)· patent assignee history
1976Based in Minneapolis, MN, US· patent location history
1979–1983Based in Tonka Bay, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
TENNANT CO61976–1983
Locations
LocationPatentsSpan
Tonka Bay, Minnesota, US41979–1983
Minneapolis, Minnesota, US21976