Robert G. Johnston

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Arnprior, CA

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Patents Grantslast 30 patents

Information Patent Grant
Magnetic coupling for stereo loudspeaker systems
- Patent number 9,071,897
- Issue date Jun 30, 2015
- Robert G. Johnston
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Swivel tweeter mechanism for a constant phase coaxial acoustic tran...
- Patent number 8,243,963
- Issue date Aug 14, 2012
- Timothy A. Gladwin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Ceiling or wall-mounted loudspeaker system with anti-diffraction wa...
- Patent number 8,014,545
- Issue date Sep 6, 2011
- DEI Headquarters, Inc.
- Matthew Grant
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electrodynamic acoustic transducer
- Patent number 7,684,582
- Issue date Mar 23, 2010
- DEI Headquarters, Inc.
- Timothy A. Gladwin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Enclosure System With Acoustic Element
- Publication number 20130156218
- Publication date Jun 20, 2013
- William R. Annacone
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Application
Swivel tweeter mechanism for a constant phase coaxial acoustic tran...
- Publication number 20100322457
- Publication date Dec 23, 2010
- Timothy A. Gladwin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Ceiling or wall-mounted loudspeaker system with anti-diffraction wa...
- Publication number 20080144873
- Publication date Jun 19, 2008
- DEI Headquarters Inc.
- Matthew Grant
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Electrodynamic acoustic transducer
- Publication number 20070036382
- Publication date Feb 15, 2007
- DEI HEADQUARTERS, INC.
- Timothy A. Gladwin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE