David J. Rycroft

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Unionville, CA

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Patents Grantslast 30 patents

Information Patent Grant
LED lamp
- Patent number 5,688,042
- Issue date Nov 18, 1997
- Lumacell, Inc.
- Abolfazl Madadi
- G08 - SIGNALLING
Information Patent Grant
Exit signs with LED illumination
- Patent number 5,365,411
- Issue date Nov 15, 1994
- Kaufel Group Ltd.
- David J. Rycroft
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS