Douglas W. Calder

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Berkshire, GB

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Patents Grantslast 30 patents

Information Patent Grant
Proximity switches
- Patent number 5,552,644
- Issue date Sep 3, 1996
- Douglas W. Calder
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Proximity switches
- Patent number 5,463,333
- Issue date Oct 31, 1995
- Square D Company
- Douglas W. Calder
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Proximity switches including long tail pair with emitter follower f...
- Patent number 5,463,354
- Issue date Oct 31, 1995
- Square D Company
- Douglas W. Calder
- H03 - BASIC ELECTRONIC CIRCUITRY