John A. Callahan

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Gasoline pump digital price encoder
- Patent number 4,242,575
- Issue date Dec 30, 1980
- RF Products Corp.
- John A. Callahan
- B67 - OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS LIQUID...
Information Patent Grant
Ticket printer
- Patent number 4,109,777
- Issue date Aug 29, 1978
- Research Fuels, Inc.
- Allan S. Ottenstein
- G07 - CHECKING-DEVICES
Information Patent Grant
Gasoline pump price encoder
- Patent number 4,100,400
- Issue date Jul 11, 1978
- RF Products Corp.
- John A. Callahan
- B67 - OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS LIQUID...