Frederick D. Lehman

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Rockford, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Drive circuits for a high resolutions cathode ray tube display
- Patent number 4,353,013
- Issue date Oct 5, 1982
- CPT Corporation
- Frederick D. Lehman
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Drive circuits for a high resolution cathode ray tube display
- Patent number 4,323,826
- Issue date Apr 6, 1982
- CPT Corporation
- Frederick D. Lehman
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Drive circuits for a high resolution cathode ray tube display
- Patent number 4,238,774
- Issue date Dec 9, 1980
- CPT Corporation
- Frederick D. Lehman
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS