Raymond J. Whitbread

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Ashton, CA

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Patents Grantslast 30 patents

Information Patent Grant
Trunk circuit with single coupling transformer
- Patent number 4,321,431
- Issue date Mar 23, 1982
- Mitel Corporation
- Patrick R. Beirne
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Transformerless trunk circuit
- Patent number 4,182,936
- Issue date Jan 8, 1980
- Mitel Corporation
- Patrick R. Beirne
- H04 - ELECTRIC COMMUNICATION TECHNIQUE