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David M. Roberts
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Saint Paul, MN, US
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Patents Grants
last 30 patents
Information
Patent Grant
Speaker stand
Patent number
11,856,347
Issue date
Dec 26, 2023
David M. Roberts
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Folding base
Patent number
10,584,824
Issue date
Mar 10, 2020
Jeffrey A. Roberts
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Boom stand stacking counterweights
Patent number
9,516,400
Issue date
Dec 6, 2016
Jeffrey A. Roberts
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Nitride sustain
Patent number
9,000,283
Issue date
Apr 7, 2015
Jeffrey A. Roberts
G10 - MUSICAL INSTRUMENTS ACOUSTICS