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Madison, MS, United States of America

Keith Halford

Average Co-Inventor Count = 1.00

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 16

Keith HalfordKeith Halford (3 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. At&t Mobility Ii LLC (2 from 2,866 patents)

2. At&t Wireless (1 from 5 patents)


3 patents:

1. 7945033 - Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system

2. 7447300 - Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system

3. 6707894 - Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system

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12/12/2025
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