Roberts Retrovalve, Inc.

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Bellevue, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Expanded performance and functions for vacuum tube replacement devices
- Patent number 7,482,863
- Issue date Jan 27, 2009
- Roberts Retrovalve, Inc.
- Douglas H. Roberts
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Vacuum tube replacement device, circuit and system
- Patent number 7,408,401
- Issue date Aug 5, 2008
- Roberts Retrovalve, Inc.
- Douglas H. Roberts
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Indicators for vacuum tube replacement devices
- Patent number 7,286,060
- Issue date Oct 23, 2007
- Roberts Retrovalve, Inc.
- Douglas H. Roberts
- G10 - MUSICAL INSTRUMENTS ACOUSTICS

Patents Applicationslast 30 patents

Information Patent Application
Expanded Performance and Functions for Vacuum Tube Replacement Devices
- Publication number 20070285156
- Publication date Dec 13, 2007
- Roberts Retrovalve, Inc.
- Douglas H. Roberts
- H03 - BASIC ELECTRONIC CIRCUITRY

Trademarklast 30 trademarks

Information Trademark
77666820 - RETROVALVE
- Serial number 77666820
- Registration number 4175911
- Filing date Feb 9, 2009
- Roberts RetroValve, Inc
- 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
Information Trademark
78649849 - RETROVALVE
- Serial number 78649849
- Filing date Jun 13, 2005
- Roberts RetroValve Corporation
- 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments