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John H. Konnert
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Reston, VA, US
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last 30 patents
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Patent Grant
Two-dimensional primitive root diffusor
Patent number
5,401,921
Issue date
Mar 28, 1995
RPG Diffusor Systems, Inc.
Peter D'Antonio
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Acoustical diffusing and absorbing cinder blocks
Patent number
5,226,267
Issue date
Jul 13, 1993
RPG Diffusor Systems, Inc.
Peter D'Antonio
E04 - BUILDING
Information
Patent Grant
Acoustical diffusing and absorbing cinder blocks
Patent number
5,193,318
Issue date
Mar 16, 1993
RPG Diffusor Systems, Inc.
Peter D'Antonio
E04 - BUILDING
Information
Patent Grant
Cinder block modular diffusor
Patent number
5,027,920
Issue date
Jul 2, 1991
RPG Diffusor Systems, Inc.
Peter D'Antonio
E04 - BUILDING
Information
Patent Grant
Cinder block modular diffusor
Patent number
4,964,486
Issue date
Oct 23, 1990
RPG Diffusor Systems, Inc.
Peter D'Antonio
E04 - BUILDING
Information
Patent Grant
Acoustical baffle
Patent number
D306764
Issue date
Mar 20, 1990
RPG Diffusor Systems, Inc.
Peter D'Antonio
D25 - Building units and construction elements
Information
Patent Grant
Sound absorbing diffusor
Patent number
4,821,839
Issue date
Apr 18, 1989
RPG Diffusor Systems, Inc.
Peter D'Antonio
E04 - BUILDING
Information
Patent Grant
Acoustical baffle
Patent number
D291601
Issue date
Aug 25, 1987
RPG Diffusor Systems, Inc.
Peter D'Antonio
D25 - Building units and construction elements