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Robert L. Keech
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White Bear Lake, MN, US
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Patents Grants
last 30 patents
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Patent Grant
Conformable magnetic articles for use with traffic bearing surfaces...
Patent number
6,468,678
Issue date
Oct 22, 2002
3M Innovative Properties Company
Thomas J. Dahlin
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Patent Grant
Conformable magnetic articles underlaid beneath traffic-bearing sur...
Patent number
5,853,846
Issue date
Dec 29, 1998
Minnesota Mining and Manufacturing Company
Gary W. Clark
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information
Patent Grant
Patterned chalk-resistant pavement marking and method of making
Patent number
5,593,246
Issue date
Jan 14, 1997
Minnesota Mining and Manufacturing Company
Thomas P. Hedblom
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Patents Applications
last 30 patents
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Patent Application
Matrix element magnetic pavement marker and method of making same
Publication number
20030123930
Publication date
Jul 3, 2003
Gregory F. Jacobs
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES