Max L. Campbell

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Topeka, KS, US

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Patents Grantslast 30 patents

Information Patent Grant
Point of purchase advertising system
- Patent number 4,670,798
- Issue date Jun 2, 1987
- Campbell; Max L.
- Max L. Campbell
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Connectors for coupling meters with meter bars
- Patent number 3,970,334
- Issue date Jul 20, 1976
- Hydro-Flex Corporation, Inc.
- Max L. Campbell
- G01 - MEASURING TESTING